BOSS ME-90B-01 Bass Multi Effects Processor User Guide

: September 12, 2024
: Boss

Table of Contents

Effects
System
Preset memory list
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Bass Multi Effects
Parameter Guide
**ME-90B

**

Effects

Effect signal chain
The signal chain (how the effects are connected) on the ME-90B is shown below.

The signal chain is automatically optimized to match the effect type that’s selected. You can change the SEND/RETURN to come after the PREAMP/EQ.

COMP/FX1 (compressor/effect 1)

Averages out the volume, giving a sustained sound without distortion. You can also select from a variety of unique effects.
In manual mode or in memory edit mode, you can turn the effect on/off with the number [1]/[COMP] pedal. Compressor/effect types

Effect type	Indicator color	Explanation
1. COMP	Blue	This models a BOSS CS-3 compact effect unit.
2. M-COMP	A compressor that uses MDP (Multi-Dimensional

Processing).
3. D-COMP| This models an MXR Dyna Comp.
4. LIMITER| Attenuates loud input levels to prevent distortion.
5. AC BASS| Simulates the sound of an acoustic bass.
6. OCTAVE| Adds pitches one and two octaves lower.
7. POLY OCTAVE| An octave effect that works with polyphonic input.
8. PITCH SHIFT| Light blue| Changes the pitch of the original sound within a range of ±2 octaves.

Use single notes when playing with this effect.
9. TUNE DOWN| Blue| Gives the effect of tuning your bass guitar lower.
Use single notes when playing with this effect.
10. S-BEND| Gives a pitch shift up/down effect.
The effect is applied while you hold down the pedal.
11. RING MOD| Combines the internal oscillator and the bass guitar tone to create an atonal, metallic sound.

You can use the BOSS TONE STUDIO for ME-90B dedicated app to exchange the #11 effect (RING MOD) with the following effects.
Different settings can be made for each memory.

Effect type	Indicator color	Explanation
BASS SIM HUM	Blue	Gives the sound of a humbucking pickup.
BASS SIM ACT	Gives the sound of an active pickup.

Knob functions

Effect type	1	2	3

1. COMP

FILTER/FX2 (filter/effect 2)

This changes the filtering to produce a wah effect.
In manual mode or in memory edit mode, you can turn the effect on/off with the number [2]/[FILTER] pedal.

Filter/effect types

Effect type	Indicator color	Explanation
1. ENV FILTER	Blue	Models the Mu-Tron III made by Musitronics.

The filter operates according to the input strength, producing a wah effect. The filter lets only the low-frequency region pass through.
2. T.WAH LPF| Blue| This changes the filter according to the input strength, producing a wah effect.
The filter lets only the low-frequency region pass through, and works on the high frequencies.
3. T.WAH BPF| Blue| This changes the filter according to the input strength, producing a wah effect.
The filter lets only specific frequencies pass through, and works on the high frequencies.
4. AUTO WAH| Light blue| This changes the filtering over a periodic cycle, providing an automatic wah effect.
5. DEFRETTER| Blue| This simulates a fretless bass.
6. ENHANCER| Blue| This emphasizes the attack portion of the sound according to the changes in input level, adding more definition to the input audio.
7. PHASER| Green| Adds an out-of-phase sound for a modulated, swelling effect.
8. HARMONIST| Light blue| Produces harmonies in the diatonic scale.

Use single notes when playing with this effect. The direct sound is set to a fixed volume.
9. OVERTONE| Light blue| This effect uses MDP technology to add new harmonics to the sound, producing resonance and richness that was not present in the original sound.
10. SLOW GEAR| Blue| This produces a volume-swell effect (“violin- like” sound).
11. HUMANIZER| Blue| Alters the bass guitar tone to make it sound more like a human voice.

You can use the BOSS TONE STUDIO for ME-90B dedicated app to exchange the #11 effect (HUMANIZER) with the following effects.
Different settings can be made for each memory.

Effect type	Indicator color	Explanation
M-COMP	Blue	A compressor that uses MDP.
T.WAH DOWN	Blue	This changes the filter according to the input

strength, producing a wah effect.
The filter works on the low frequencies.
ENV FILTER BPF| Blue| Models the Mu-Tron III made by Musitronics.
The filter operates according to the input strength, producing a wah effect. The filter lets only specific frequencies pass through.
FLANGER| Purple| Adds modulation that sounds like a jet airplane taking off and landing.
SCRIPT PHASER| Green| This models the MXR Phase 90 which was manufactured during the ‘70s.

Knob functions

Effect type	1	2	3
1. ENV FILTER	**SENS

0–99
Sets the input sensitivity.| TONE
0–99
Sets the tone (brightness).| PEAK
0–99
Sets the strength (character) of the effect.
2. T.WAH LPF| SENS
0–99
Sets the input sensitivity.| TONE
0–99
Sets the tone (brightness) of the wah effect.| PEAK
0–99
Sets the strength (character) of the effect.
3. T.WAH BPF| SENS
0–99
Sets the input sensitivity.| TONE
0–99
Sets the tone (brightness) of the wah effect.| PEAK
0–99
Sets the strength (character) of the effect.
4. AUTO WAH| RATE
0–99
Sets the speed of modulation.| DEPTH
0–99
Sets the amount of modulation.| E. LEVEL
0–99
Sets the volume of the effect sound.
5. DEFRETTER| SENS
0–99
Sets the input sensitivity.| TONE
0–99
Sets the tonal brightness.| LEVEL
0–99
Sets the volume.
6. ENHANCER| SENS
0–99
Sets the input sensitivity.| TONE
0–99
Sets the frequency range of the enhancer audio.| LEVEL
0–99
Adjusts the volume of the enhancer audio.
7. PHASER| RATE
0–99
Sets the rate of the modulation.| DEPTH
0–99
Sets the amount of modulation.| RESONANCE
0–99
Sets the strength (character) of the effect.
8. HARMONIST| KEY
C (Am)–B (GRm) Sets the key of the song you’re playing. 1| HARMONY
-8th–DETUNE–+8th
Sets the pitch of the harmony sound in steps. This gives a detuning effect when “0” is shown on the display. 2| E. LEVEL
Sets the volume of the effect sound.
9. OVERTONE| UPPER
0–99
Adjusts the volume of the harmonic one octave above.| LOWER
0–99
Adjusts the volume of the harmonic one octave below.| D. LEVEL
0–99
Sets the volume of the direct sound.
10. SLOW GEAR| SENS
0–99
Sets the input sensitivity.| ATTACK
0–99
Sets how long it takes to reach maximum volume.| LEVEL
0–99
Sets the volume.
11. HUMANIZER| SENS
0–99
Sets the input sensitivity.| VOWEL1
a, e, i, o, u
Selects the first vowel.| VOWEL2
a, e, i, o, u
Selects the second vowel.
11. M-COMP| SUSTAIN
0–99
Sets how long the sound rings out (sustains).| ATTACK
0–99
Sets the attack time of the sound.| LEVEL
0–99
Sets the volume.
11. T.WAH DOWN| SENS| TONE| PEAK**
0–99
Sets the input sensitivity.| 0–99
Sets the tone (brightness) of the wah
effect.| 0–99
Sets the strength (character) of the effect.

11. ENV FILTER BPF

| SENS| TONE| **PEAK
0–99
Sets the strength (character) of the effect.
---|---|---|---
0–99
Sets the input sensitivity.| 0–99
Sets the tone (brightness) of the wah effect.
11. FLANGER| ****RATE ** 0–99
Sets the speed of modulation.| **DEPTH
0–99
Sets the amount of modulation.| ****RESONANCE
0–99
Sets the strength (character) of the effect.
11. SCRIPT PHASER| ****RATE **| **DEPTH **| **E. LEVEL **
0–99
Sets the rate of the modulation.| 0–99
Sets the amount of modulation.| 0–99
Sets the volume of the effect sound.

*1: Song keys and sheet music accidentals (´, ³)

*2: Examples of harmony indications

DRIVE/SYNTH (Drive/Synthesizer)

The drive effect distorts the audio, and the synthesizer effect processes the input audio to create a synth-like sound.
In manual mode or in memory edit mode, you can turn the effect on/off with the number [3]/[DRV/SYN] pedal.

Drive/synthesizer types

Effect type	Indicator color	Explanation
1. BOOST	Yellow	Gives a punchy, clean tone.
2. OVERDRIVE	Yellow	Overdrive tuned especially for use with

Be sure to mute all the other strings and play only one note at a time.
11. SYNTH SQUARE| Blue| Processes the bass input sound to create a synth sound with a square wave signal.

You can use the BOSS TONE STUDIO for ME-90B dedicated app to exchange the #11 effect (SYNTH SQUARE) with the following effects.
Different settings can be made for each memory.

Effect type	Indicator color	Explanation
HI BAND	Orange	With this effect, distortion is applied only to the

high frequency sounds, and not to the sounds in the low frequency range.
This effect retains a strong low end sound while adding powerful distortion.
BLUES OD| Yellow| The sound of the BOSS BD-2.
’60S FUZZ| Red| This models a FUZZFACE.
OCT FUZZ| Red| The Octavia sound (a certain kind of fuzz with a mixed-in tone one octave higher).

Knob functions

Effect type	1	2	3
1. BOOST	DRIVE

DLY/REV (Delay/Reverb)

Delays the sound to create an echo-like effect. You can also use this to add reverberations to the sound.
In manual mode or in memory edit mode, you can turn the effect on/off with the number [4]/[DLY/REV ] pedal.

Delay types

Effect type	Indicator color	Explanation
1. STANDARD	White	Delays the sound to create an echo-like effect.

The delay time can be set within a range of 10–800 ms (milliseconds).
2. ANALOG| White| Gives a mild analog delay sound.
3. MODULATE| White| This delay adds a pleasant wavering effect to the sound.
4. TEMPO| White| Use the pedal to set the delay time (tempo).
5. TERA ECHO| White| This effect uses MDP technology for a unique ambience and spaciousness that changes with the dynamics of the input signal.
6. PHRASE LOOP| White| Lets you record your performance and play it back repeatedly. This is useful for both playing live and when practicing.
7. ROOM| Blue-green| Simulates the reverberation in a small room.
8. HALL| Blue-green| Simulates the reverberation in a concert hall.
9. PLATE| Blue-green| Simulates plate reverberation (a reverb unit that uses the vibration of a metallic plate).
Provides a metallic sound with a distinct upper range.
10. SHIMMER| Blue-green| A reverb with a brilliant-sounding high end. This creates dreamlike reverberations full of expanding harmonics.
11. DELAY+REVERB| White| This effect combines delay and reverb, which multiplies to create rich reverberations.

You can use the BOSS TONE STUDIO for ME-90B dedicated app to exchange the #11 effect (DELAY+REVERB) with the following effects.
Different settings can be made for each memory.

Effect type	Indicator color	Explanation
STEREO CHORUS	Light blue	This is a two-phase stereo chorus effect

that adds different chorus sounds to the L and R channels.
CE-1 CHORUS| Light blue| The chorus sound of the BOSS CE-1.
CHO + DELAY| White| A delay combined with chorus.
WARP| White| Produces a dream-like sound.
The effect is applied while you hold down the pedal.
TWIST| White| Produces an aggressive sense of rotation.
Using this in conjunction with distortion produces an even wilder sense of rotation. The effect is applied while you hold down the pedal.
GLITCH| White| Creates a machine gun-like delay effect.
The effect is applied while you hold down the pedal.

Knob functions

Effect type	1	2
TIME	FEEDBACK	E. LEVEL
1. STANDARD	10–800
Sets the delay time (10–800 ms) in units of 10 ms. *1	0–99

Adjusts the amount of feedback.
Higher values increase the number of delay repeats.| 0–99
Sets the volume of the effect sound.
2. ANALOG| TIME| FEEDBACK| E. LEVEL
10–800

Sets the delay time (10–800 ms) in units of 10 ms. *1

| 0–99

Adjusts the amount of feedback.

Higher values increase the number of delay repeats.

| 0–99

Sets the volume of the effect sound.

3. MODULATE| TIME| FEEDBACK| E. LEVEL
10–800

Sets the delay time (10–800 ms) in units of 10 ms. *1

| 0–99

Adjusts the amount of feedback.

Higher values increase the number of delay repeats.

| 0–99

Sets the volume of the effect sound.

4. TEMPO| Ň , ņ| FEEDBACK| E. LEVEL
Sets the beat of the delay. *2| 0–99

Adjusts the amount of feedback.

Higher values increase the number of delay repeats.

| 0–99

Sets the volume of the effect sound.

5. TERA ECHO

| TIME| FEEDBACK| E. LEVEL
0–99

Adjusts the length of the effect sound.

| 0–99

Adjusts the decay of the effect sound.

| 0–99

Sets the volume of the effect sound.

6. PHRASE LOOP| –

No function is controlled.

| –

No function is controlled.

| LEVEL
0–99

Sets the volume of the phrase loop.

7. ROOM| TIME| TONE| E. LEVEL
0–99

Adjusts the length (time) of reverberation.

| 0–99

Adjusts the tonal character of the reverb.

| 0–99

Adjusts the volume of the reverb sound.

8. HALL| TIME| TONE| E. LEVEL
0–99

Adjusts the length (time) of reverberation.

| 0–99

Adjusts the tonal character of the reverb.

| 0–99

Adjusts the volume of the reverb sound.

9. PLATE| TIME| TONE| E. LEVEL
0–99

Adjusts the length (time) of reverberation.

| 0–99

Adjusts the tonal character of the reverb.

| 0–99

Adjusts the volume of the reverb sound.

10. SHIMMER| TIME| TONE| E. LEVEL
0–99

Adjusts the length (time) of reverberation.

| 0–99

Adjusts the tonal character of the reverb.

| 0–99

Adjusts the volume of the reverb sound.

11. DELAY+REVERB| TIME| FEEDBACK| E. LEVEL
10–800

Sets the delay time (10–800 ms) in units of 10 ms. *1

| 0–99

Adjusts the amount of feedback.

Higher values increase the number of delay repeats.

| 0–99

Sets the volume of the effect sound.

11. STEREO CHORUS| RATE| DEPTH| E. LEVEL
0–99

Sets the speed of modulation.

| 0–99

Sets the amount of modulation.

| 0–99

Sets the volume of the effect sound.

11. CE-1 CHORUS| RATE| DEPTH| E. LEVEL
0–99
Sets the speed of modulation.| 0–99
Sets the amount of modulation.| 0–99
Sets the volume of the effect sound.
11. CHO + DELAY| TIME| FEEDBACK| E. LEVEL
---|---|---|---
10–800

Sets the delay time (10–800 ms) in units of 10 ms. *1

| 0–99

Adjusts the decay of the effect sound.

| 0–99

Sets the volume of the effect sound.

11. WARP| TIME| –

No function is controlled.

| E. LEVEL
10–800
Sets the delay time (10–800 ms) in units of 10 ms. *1| 0–99
Sets the volume of the effect sound.
11. TWIST| RISE TIME| FALL TIME| E. LEVEL
0–99
Adjusts the amount of time it is to take for the effect to transition to the maximum.| 0–99
Adjusts how much time it takes for the rotary effect to stop.| 0–99
Sets the volume of the effect sound.
11. GLITCH| TIME| GLITCH| BALANCE
0–99
Adjusts the length of the effect sound.| 0–99
Adjusts the intensity of the effect.| 0–99
Adjusts the volume balance between the direct sound and effect sound. A setting of “99” mutes the direct sound.

*1: Examples of delay time (TIME) indications

*2: Examples of beat ( ) indications

PREAMP/EQ (Preamp/Equalizer)

This models the characteristics of a preamp. This effect also adjusts the tonal character.
In manual mode or in memory edit mode, you can turn the effect on/off with the [BANK ]/[AMP] pedal.

Preamp/equalizer types

Effect type	Indicator color	Explanation
1. NATURAL	Green	A simple, clean sound for bass guitar.
2. DRIVE BASS	Orange	High-gain sound for bass guitar, using MDP to

You can use the BOSS TONE STUDIO for ME-90B dedicated app to exchange the #11 effect (EQ) with the following effects.
Different settings can be made for each memory.

Effect type	Indicator color	Explanation
SUPER FLAT	Green	An amp with flat tonal characteristics.
FLIP TOP	Yellow	This models the Ampeg B-15.
SW-TOUR	Yellow	This models the SWR SM-400.
DARK DRV+CAB	Red	This models the Darkglass Electronics MICROTUBES

B7K (Cab Sim ON).
GTR CRUNCH| Yellow| A guitar amp with a crunch sound that uses MDP to deliver a crisp tone from all strings.
GTR HI GAIN| Orange| A guitar amp with a high-gain sound that uses MDP to provide a wide ranging and comfortable sense of separation.
GTR MODDED| Red| A guitar amp with a core sound that uses MDP to preserve the definition of the sound even with extreme gain.

Knob functions

Effect type	1	2	3	4	5

All PREAMP types

| BASS| MIDDLE| TREBLE| GAIN| LEVEL
0–99
Adjusts the volume of the low-frequency range.| 0–99
Adjusts the volume of the middle-frequency range.| 0–99
Adjusts the volume of the high-frequency range.| 0–99
Adjusts the amount of distortion in the preamp.| 0–99
Adjusts the volume of the entire preamp.
| BASS| MIDDLE| MID FREQ| GAIN| LEVEL
---|---|---|---|---|---
EQ| 0–99
Adjusts the volume of the low-frequency range.| 0–99
Adjusts the volume of the middle-frequency range.| 100–2.5 kHz
Sets the frequency of the midrange.| 0–99
Adjusts the volume of the high-frequency range.| 0–99
Sets the volume.

MOD (modulation)

Adds spaciousness or an undulating character to the sound.
In manual mode or in memory edit mode, you can turn the effect on/off with the [BANK ]/[MOD] pedal.

Effect type

You can use the [TYPE] knob to change how the effects work.

Effect type	Indicator color	Type	Explanation
1. CHORUS	Light blue	1: MONO	Chorus is an effect that creates a

beautiful spaciousness and depth by adding a slightly modulated sound.
2: STEREO| This is a two-phase stereo chorus effect that adds different chorus sounds to the L and R channels.
3: CE-1| The chorus sound of the BOSS CE-1.
2. TREM/PAN| Green| 1: TREMOLO| Gives a retro effect by cyclically changing the volume.
2: PAN| With the volume level of the left and right sides alternately changing, when playing sound in stereo, you can get an effect that makes the guitar sound appear to fly back and forth between the speakers.
3. FLANGER| Purple| –| Adds modulation that sounds like a jet airplane taking off and landing.
4. SLICER| Green| 1–20: switches between slice patterns| This effect continuously cuts up the sound to generate a variety of slice patterns. The first beat of pattern 1 plays at the same time that the effect is turned on.
5. DELAY| White| 1: STANDARD| Delays the sound to create an echo- like effect.
2: ANALOG| Gives a mild analog delay sound.
3: MODULATE| This delay adds a pleasant wavering effect to the sound.
6. COMP| Blue| 1: COMP| This models a BOSS CS-3.
2: M-COMP| A compressor that uses MDP.
3: D-COMP| This models an MXR Dyna Comp.

You can use the BOSS TONE STUDIO for ME-90B dedicated app to exchange the #6 effect (COMP) with the following effects.
Different settings can be made for each memory.

Effect type	Indicator color	Explanation
PRE EQ	Green	This is a three-band equalizer. This is inserted

before distortion effects.
POST EQ| Green| This is a three-band equalizer. This is inserted after the preamp.
VIBRATO| Light blue| This effect creates vibrato by slightly modulating the pitch.
ROTARY| Light blue| Produces a stereo effect like the sound of a rotary speaker.
OVERTONE| Light blue| This effect uses MDP technology to add new harmonics to the sound, producing resonance and richness that was not present in the original sound.
SLICER ATK +| Green| An effect with a stronger slicer attack volume.
SLICER ATK –| Green| An effect with a weaker slicer attack volume.

Knob functions

Effect type	1	2	3	4
1. CHORUS	**TYPE

1: MONO
2: STEREO
3: CE-1
Selects the effect type.| RATE
0–99
Sets the speed of modulation.| DEPTH
0–99
Sets the amount of modulation.| E. LEVEL
0–99
Sets the volume of the effect sound.
2. TREM/PAN| TYPE
1: TREMOLO
2: PAN
Selects the effect type.| RATE
0–99
Sets the speed of modulation.| DEPTH
0–99
Sets the amount of modulation.| E. LEVEL
0–99
Sets the volume of the effect sound.
3. FLANGER| –
No function is controlled.| RATE
0–99
Sets the speed of modulation.| DEPTH
0–99
Sets the amount of modulation.| RESONANCE
0–99
Sets the strength (character) of the effect.
4. SLICER| TYPE
1–20
Selects the slice pattern.| RATE
0–99
Adjust the rate at which the sound will be cut.| DUTY
0–99
Adjusts the duration of the sound for the slice pattern.| E. LEVEL
0–99
Sets the volume of the effect sound.
5. DELAY| TYPE
1: STANDARD
2: ANALOG
3: MODULATE
Selects the effect type.| TIME
* 10–800
Sets the delay time (10–800 ms) in units of 10 ms. 1| FEEDBACK
0–99
Adjusts the amount of feedback.
Higher values increase the number of delay repeats.| E. LEVEL
0–99
Sets the volume of the effect sound.
6. COMP| TYPE
1: COMP
2: M-COMP
3: D-COMP
Selects the effect type.| SUSTAIN
0–99
Sets how long the sound rings out (sustains).| ATTACK
0–99
Sets the attack time of the sound.| LEVEL
0–99
Sets the volume.
6. PRE EQ| BASS
0–99
Adjusts the sound level of the low-frequency range.| MIDDLE
0–99
Adjusts the sound level of the middle-frequency range.| TREBLE
0–99
Adjusts the sound level of the high-frequency range.| LEVEL
0–99
Sets the volume.
6. POST EQ| BASS
0–99
Adjusts the sound level of the
low-frequency range.| MIDDLE
0–99
Adjusts the sound level of the
middle-frequency range.| TREBLE
0–99
Adjusts the sound level of the high-frequency range.| LEVEL
0–99
Sets the volume.
6. VIBRATO| –

No function is controlled.

| RATE
0–99
Sets the speed of modulation.| DEPTH
0–99
Sets the amount of modulation.| E. LEVEL
0–99
Sets the volume of the effect sound.
6. ROTARY| –

No function is controlled.

| RATE
0–99
Sets the speed of modulation.| DEPTH
0–99
Sets the amount of modulation.| E. LEVEL
0–99
Sets the volume of the effect sound.
6. OVERTONE| –

No function is controlled.

| UPPER
0–99
Adjusts the volume of the
harmonic one octave above.| LOWER
0–99
Adjusts the volume of the harmonic one octave below.| D. LEVEL
0–99
Sets the volume of the direct sound.
6. SLICER ATK+| TYPE
1–20
Selects the slice pattern.| RATE
0–99
Adjust the rate at which the sound will be cut.| DUTY
0–99
Adjusts the duration of the sound for the slice pattern.| E. LEVEL
0–99
Sets the volume of the effect sound.
---|---|---|---|---
6. SLICER ATK-| TYPE
1–20
Selects the slice pattern.| RATE
0–99
Adjust the rate at which the sound will be cut.| DUTY
0–99
Adjusts the duration of the sound for the slice pattern.| E. LEVEL
0–99
Sets the volume of the effect sound.

*1: Examples of delay time (TIME) indications

BLEND

The direct sound is mixed with the output signal.
In manual mode or in memory edit mode, you can turn the effect on/off with the [CTL]/[BLEND] pedal.

Effect type

Effect type	Indicator color	Explanation
BLEND	White	Adjusts the volume of the direct sound (value: 0–99).

When this is set to “0”, blend is turned off.

PEDAL FX (pedal effects)

Lets you achieve various effects using the expression pedal on this unit.
You can turn the pedal effect on/off by pushing the expression pedal up with your weight on your toes.
When the pedal effect is off, the expression pedal works as a foot volume pedal.

Pedal effect types

Effect type	Indicator color	Explanation
1. WAH	Pink	A wah effect.
2. +1OUT	Pink	Lets you continuously change the pitch respective to

the original, over a range of +1 octave.

Use single notes when playing with this effect.
3. +2OCT| Pink| Lets you continuously change the pitch respective to the original, over a range of +2 octaves.
Use single notes when playing with this effect.
4. -1OCT| Pink| Lets you continuously change the pitch respective to the original, over a range of -1 octave.
Use single notes when playing with this effect.
5. -2OCT| Pink| Lets you continuously change the pitch respective to the original, over a range of -2 octaves.
Use single notes when playing with this effect.
6. FREEZE| Pink| When you press the pedal, the freeze function turns on, which makes the bass guitar sound sustain.
The freeze function is applied right when you press the pedal.
7. OSC DELAY| Pink| An effect that uses feedback and time to generate delay oscillation, which you can control with just the pedal.
8. DRV/SYN| Orange| Lets you control the DRIVE or FREQ parameters when using the DRIVE/SYNTH effect.
The maximum value you can control with the expression pedal is the value you set using the [DRIVE] knob.
The changes to the filter in response to bass guitar input are disabled when you’re controlling FREQ with the expression pedal.
9. MOD RATE| Light blue| Lets you control the RATE parameter when using MOD (modulation) effects.
The maximum value you can control with the expression pedal is the value you set using the [RATE] knob.
10. DELAY LEVEL| White| Lets you control the delay level when using DELAY.
The maximum value that you can control using the expression pedal is the value that’s set using the [E. LEVEL] knob.
11. BLEND| White| You can control the blend level when using BLEND.
The maximum value you can control with the expression pedal is the value you set using the [BLEND] knob.
When you operate the expression pedal, please be careful not to get your fingers pinched between the movable part and the unit. In places where small children are present, make sure that an adult provides supervision and guidance.

System

Parameter	Display	Explanation
OUTPUT SELECT		Specifies the amp that’s connected to the OUTPUT

jacks.
| Use this setting when connecting to a bass amp with tweeter.
| Use this setting when connecting to a bass amp without a tweeter.
Knob motion| | The parameter value changes instantly when you operate the knobs (this is the factory setting).
| The value only changes once the knob position reaches the parameter’s current value.
USB LEVEL| | Adjusts the level of audio input from your computer, which is mixed with the sound that passes through the ME-90B’s effects.
USB DIRECT MONITOR
* Power-on setting is 1| | The sound of the ME-90B is not output from the PHONES jack, the OUTPUT jacks or the BALANCED OUTPUT connector.
| The sound of the ME-90B is output from the PHONES jack, the OUTPUT jacks and the BALANCED OUTPUT connector.
USB LOOPBACK| | The input audio from the computer is not output via USB OUT.
| The input audio from the computer is output via USB OUT.
MIDI channels| | ch 1–ch 9, ch 10–ch 16
Output settings when using the tuner| | No audio is output when you’re using the tuner.
| The direct sound is output while you’re using the tuner.
Bank switch operation|

| Pressing the bank pedal to switch banks only changes the bank shown in the display, without actually switching to a different memory. Both the bank and number are confirmed right when you press a numbered pedal, and the unit switches to the next memory (when using the factory setting).
| The memory switches instantly when a bank pedal or numbered pedal is pressed.
Switching to manual mode| | When you switch from memory mode to manual mode, the current knob settings are applied to the sound.

| When you switch from memory mode to manual mode, the memory settings are carried over (factory setting).

The manual mode settings are retained when you switch from manual to memory mode.

SEND/RETURN insertion point setting| | SEND/RETURN are connected before the preamp/EQ in the signal chain. This is the optimal setting when using a distortion pedal or the like (factory setting).
| SEND/RETURN are connected after the preamp/EQ in the signal chain. This is the optimal setting when using a delay pedal or the like.
Preserving/muting the effect sound when turning effects off or switching between memories| | When you switch memories, the effect’s delay/reverb sound you selected in DLY/REV is not carried over. This does not apply to the DELAY for MOD settings.
| When you switch memories, the effect’s delay/reverb sound you selected in DLY/REV is carried over (factory setting). This does not apply to the DELAY for MOD settings.
LED illumination color| | The LEDs can light up in one of ten colors (factory setting).

| The LEDs only light up to indicate their state in white and in color changes that are easy to distinguish (only red, yellow and blue).

This mode is recommended for users with difficulties distinguishing colors or who prefer a classic- looking display.

BLEND footswitch function settings| | Turns BLEND on/off in manual mode (factory setting).
| In manual mode, this turns SEND/RETURN on/off.

Preset memory list

Memory No.| Memory Name| CTL switch| Exp. Pedal
---|---|---|---
P1- 1| NATURAL CLEAN| DRIVE/SYNTH ON/OFF| Foot Volume (WAH)
P1- 2| ADVANCED OD| MOD ON/OFF| Foot Volume (+1OCT)
P1- 3| CHORUS SLAP| FILTER/FX2 ON/OFF| Foot Volume (MOD RATE)
P1- 4| FUNKY FILTER| DRIVE/SYNTH ON/OFF| Foot Volume (WAH)
P2- 1| ROCK CRUNCH| DLY/REV ON/OFF| Foot Volume (-1OCT)
P2- 2| DARK DRIVE| DRIVE/SYNTH ON/OFF| Foot Volume (-1OCT)
P2- 3| FUZZ BASS| DLY/REV ON/OFF| Foot Volume (DRV/SYN)
P2- 4| LOW OCTAVE| PEDAL FX ON/OFF
BLEND ON/OFF| BLEND
P3- 1| CONTRABASS| DLY/REV ON/OFF| Foot Volume (-1OCT)
P3- 2| CLASSIC FUNK| DRIVE/SYNTH ON/OFF| Foot Volume (-1OCT)
P3- 3| FRETLESS| DLY/REV ON/OFF| Foot Volume (+1OCT)
P3- 4| SYNTH BASS| MOD ON/OFF| Foot Volume (WAH)
P4- 1| STUDIO SLAP| FILTER/FX2 ON/OFF| Foot Volume (-1OCT)
P4- 2| SOUL CONCERT| DRIVE/SYNTH ON/OFF| Foot Volume (WAH)
P4- 3| SHIMMER REVERB| MOD ON/OFF| Foot Volume (DELAY LEVEL)
P4- 4| OCTAVE SLICER| FILTER/FX2 ON/OFF| +2OCT
P5- 1| PUNCHY STACK| FILTER/FX2 ON/OFF| Foot Volume (WAH)
P5- 2| MILD TUBE| MOD ON/OFF| Foot Volume (WAH)
P5- 3| BASS DI DRIVE| MOD ON/OFF| Foot Volume (WAH)
P5- 4| SYNTH SOLO| MOD ON/OFF| Foot Volume (DRV/SYN)
P6- 1| MID DISTORTION| DLY/REV ON/OFF| Foot Volume (WAH)
P6- 2| MODERN ROCK DRV| DRIVE/SYNTH ON/OFF| Foot Volume (WAH)
P6- 3| ORGAN SOLO| COMP/FX1 ON/OFF| Foot Volume (WAH)
P6- 4| SYNTH CHORUS| FILTER/FX2 ON/OFF| Foot Volume (WAH)
P7- 1| R&B PHASER| MOD ON/OFF
DLY/REV ON/OFF| Foot Volume (DRV/SYN)
P7- 2| FUZZ SOLO| DLY/REV ON/OFF| Foot Volume (FREEZE)
P7- 3| MOD DELAY| FILTER/FX2 ON/OFF

MOD ON/OFF

DRIVE/SYNTH ON/OFF

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