Eventide H949 Dual Plugin Harmonizer User Guide

User Guide
H949

Welcome

H949 Single Harmonizer®

H949 Dual Harmonizer®

1.1 About This Product
Thank you for your purchase of the Eventide H949 Harmonizer® plug-in. The productrecreated in this plug-in was among the first introduced by Eventide, and among the world’s first commercially available professional recording products. For over 40 years, innovative products like these have made Eventide an industry leader, and we are extremely proud that they continue to be in demand today. This package includes a stunning recreation of the H949 Harmonizer®, as well as a Dual H949 version, which recreates the popular technique of running two H949 units in parallel to create lush doubling and other interesting effects.

We’ll get into more depth on the product soon but, before you forget, please take a few minutes to register online. This helps us keep you informed of any important software updates, and any special offers that may only be available to registered users.

H949 Harmonizer®

Production Dates: 1977 – 1984
The Eventide Clockworks H949, which debuted shortly after the H910, was the world’s first ”de-glitched” Harmonizer® product – and may even have been the world’s first multi-effect audio product. It not only offered 3 octaves of pitch change but also featured Micro and Random pitch, Delay only, Flange, and unique Reverse modes. When used
with a tape recorder, it also made time expansion and compression possible for the first time ever.
All of the original features and sound are recreated here. Spend some time with the controls, and you will find a wide range of sound effects can be created using the few front panel controls. Also, be sure to audition the two pitch algorithms provided for the variety of sources you may feed into it.
The original H949 hardware unit featured two outputs – the Main Output, which passed the affected signal, and a Delay Only Output, which passed a delayed (but otherwise non-affected) signal. These are recreated in the plugin, with the level of each controlled by the Main Level and Delay Level knobs.

2.1 H949 Single Harmonizer® Controls

Main H949 Panel

Line
When the Line control is IN the unit is actively processing audio; when it is OUT the unit is bypassed and passes audio directly from input to output.

Input Level
This is used to set the optimum operating level for the system. The knob acts as a conventional volume control. Five-level indicators provide visual cues as to the actual level of the incoming signal. In normal operation, the yellow PRESENT LED indicates that a low-level signal (-60dBfs) is being applied to the input. The 3 green NORMAL LEDs illuminate in sequence (-12 dBfs, -6dBfs, -3dBfs) to indicate a minimal driving signal and increasing levels within the normal range. The red LIMIT LED lights within 0.5 dBfs of clipping. Note that all of these indicators are peak-responsive and will light on ”peaky” material even if the average signal level is quite low. The ideal setting will drive all of the green LEDs, with no flashes of the red LED. Note that the level indicators are after the feedback, i.e. they measure Input + Main Feedback + Delay Only Feedback, to indicate any digital clipping at the pitch shifter input.

Repeat
This locking pushbutton is used to capture and repeat audio segments. Pressing it captures the last 400 ms of audio and recirculates it until Repeat is pressed again.
Remember that pressing Repeat captures the signal content of the current memory buffer.
**** If you are listening to a delayed output, part or all of the segment heard immediately before pressing Repeat may be lost. To avoid this, monitor either the input signal or a non-delayed output when attempting to capture precise segments.

Feedback
The Feedback controls route a portion of the output signal back to the input. The output of these controls is mixed with the input signal but is independent of the gain adjustment provided by Input Level. Gains are normalized so that, with EQ controls approximately centered, the feedback level varies from 0 to 100% (loop gain of unity or ”infinite” sustain) as the Level knobs are advanced from OFF to MAX.

MAIN LEVEL — adjusts the feedback from the Main Output to the input.
DLY ONLY — adjusts the feedback from the Delay Only Output to the input.
LOW EQ — adjusts the relative level of bass frequencies present in the feedback mix. When the knob is turned counterclockwise, lows are cut; when turned clockwise, lows are boosted.
HIGH EQ — adjusts the relative level of high frequencies present in the feedback mix. When the knob is turned counterclockwise, and boosting them when the knob is turned clockwise.

When both EQ knobs are centered, the frequency response of the feedback chain is approximately flat.
Delay Only Output Controls the delay time of the Delay Only Output. This output only adds delay to the original input signal – the Pitch Control section has no effect. The locking pushbuttons can be activated in any combination. Delay times are selected in 6.25 ms increments to a maximum of 393.75 ms (6.25 + 12.5 + 25 + 50 + 100+ 200).

Use caution when adjusting the feedback controls until you are fully familiar with their interaction.
**** They can easily be set to a point where loop gain exceeds unity at various frequencies, and create uncontrolled oscillation.

Pitch This block of controls is associated primarily with manual/remote
Control/Readout control of the output pitch ratio vs. the input signal.
PITCH RATIO — indicated on a 4-digit display showing the numerical pitch ratio between input and output. Note that, just as in the original unit, when the knob is set between two values, the display will ”jitter” between the two. This is visual jitter only and does not affect the audio.
MANUAL — adjusts the pitch ratio from 2 octaves down to 1 octave up, and also determines the rate of delay change in Flange and Random modes.
REMOTE — This switch allows remote control via MIDI. In Manual mode, the manual knob controls the Pitch Ratio. When MIDI is selected, the pitch ratio will be determined by receipt of MIDI Note On and Pitch Bend messages. (For more information, see: “Working with the Harmonizer®”.)

Function Select
The Function Select button and the 4 switches to its right allow you to select the basic operating modes of the H949. When pressed IN, the 4 switches function as labeled in red below eachswitch. When the Function button is OUT, the switches function as labeled in green above the switches. LEDs indicate which switch is selected and show (by lighting red or green) which function is active. The functions controlled by these switches fall into two major groups: Pitch Change effects (activated when the Function button is IN) and Delay/Reversal effects (activated when the Function button is OUT). The effect in Reverse and Extend modes is most apparent with large delay times.

PITCH CHANGE FUNCTIONS (Function button IN, red labels apply)

NORM – normal pitch change mode. Adjusting the Manual knob over its full range gives pitch ratios from 0.250 (2 octaves down) to 2.000 (1 octave up).
EXTEND – permits extension of the length of the audio segment over which pitch change will be affected, up to the full extent of the H949 memory (400 ms). N.B. Main  Output delay is not available in Extend mode – the Main Output delay switches are instead used to determine the length of the audio segment used for pitch change.
UPC (Micro Pitch Change) – Sharp and Flat modes operate in a manner similar to normal Pitch Change, except that the range of pitch ratios is restricted to about 1:1.07 (Sharp) and 1:0.93 (Flat). In these modes, the pitch ratio is closest to 1:1 when the Manual knob is fully counterclockwise. In Sharp, clockwise rotation increases the pitch; in Flat, clockwise rotation decreases the pitch.

DELAY/REVERSAL FUNCTIONS

DELAY —
In this mode, the Main Output button allows you to add successive amounts of delay before the main output.
RANDOM —
causes the output delay to vary between the maximum limits of 0-25 ms at a constant rate of change, though the actual delay limits will typically be smaller on any given excursion and are chosen pseudo-randomly. This simulates the random variations of double-tracking, or of multiple musicians or singers performing simultaneously, without the ”mechanical” sound of a fixed delay. The desirable effect of having performers slightly out of tune is automatically achieved due to the fact that the pitch alters slightly as the delay changes. A manual knob controls the rate at which the delay varies from the upper to lower limit, thus changing the amount of pitch alteration.
FLANGE –
This switch sets the H949 into automatic flagging mode. Flanging is the effect created by frequency cancellations when a signal with a varying delay is added to another constant signal. The lowest frequency affected is roughly reciprocal of the time delay (0-10 ms), so a 1ms delay causes a cancellation at 1kHz and multiples thereof. In this mode, Manual controls sweep, the rate at which the variable delay changes.
REVERSE –
causes short signal segments (up to the 400 memory capacity of the system) to be played back in time-reversed order. N.B. Main Output delay is not available
in Reverse mode – the Main Output delay switches are instead used to select the length of the reversed segments.
Algorithm Select –
The H949 allows you to select one of two pitch change algorithms in order to support optimal pitch change with a variety of source materials. In general, Algorithm 2 is glitch-free, but will add varying degrees of coloration to the signal, and is more suitable for extreme pitch ratios. Algorithm 1 may cause glitches with increasing frequency as the pitch ratio deviates from 1:1, and is generally more appropriate for smaller pitch ratios. We recommend experimentation to determine which algorithm is most appropriate for any given program material and pitch ratio. The two algorithms converge in audible effect as pitch ratios approach an octave in either direction, and both will perform identically at these extremes.

Main Output
Controls the delay time of the Main Output. The locking pushbuttons can be activated in any combination. Delay times are selected in 6.25 ms increments to a maximum of 393.75 ms (6.25 + 12.5 + 25 + 50 + 100 + 200).

Power
When the Power button is IN the unit is powered up and operational, when it is OUT the unit is powered off and the plug-in bypasses.

Expansion Panel Controls

Delay Level
This parameter controls the level of the Delay Only Output from the H949 unit.
Mix Level
This parameter sets the overall balance of wet signal to dry signal. This parameter controls the level of the Main Output (pitch-shifted output) from the H949 unit.

2.2 H949 Dual Harmonizer® Controls
The H949 Harmonizer® plug-in comes bundled with the H949 Dual Harmonizer® plugin, which recreates two H949 units running in parallel, an application that was frequently used in the hardware version to create doubling effects. Of course, you can also use the H949 Dual to create a wide variety of other interesting sounds. The H949 Dual includes two Main Panels (as described above), and an Expansion Panel with several additional controls.

Expansion Panel Controls

Stereo Feedback
The three buttons in this group allow you to control the feedback routing between the two H949 units. In MONO mode, the output from a single unit only feeds back into that unit. In STEREO mode, the output from the top unit feeds back into the bottom unit, and vice versa. In BOTH mode, the output of each unit feeds back into both itself and the other unit. An interesting application of these modes is when using feedback combined with pitch- shifting: based on the Pitch Ratios of the bottom and top units, can cause the incoming signal to shift up/down continuously, shift up and then down continuously, or shift away from a Pitch Ratio of 1 in both directions.

Stereo Link
The three buttons in this group allow you to more easily control the plug-in, by linking corresponding controls in the bottom and top units. In MONO mode, all controls can be set independently. In LINK mode, changing a control on one unit will cause the corresponding control on the other unit to follow that change. REVERSE LINK mode behaves much like LINK mode, but changing the Pitch Ratio on one unit will cause the other unit’s Pitch Ratio to move in the opposite direction. This is especially useful for creating stereo detuned and doubling effects.
N.B. the Power and Line are always linked, regardless of the Stereo Link setting.

Stereo Width Allows you to control how ”wide” the output of the plug-in is,from mono to full stereo.
Delay Level This parameter controls the level of the Delay Only Output from the H949 units.
Mix Level This parameter sets the overall balance of wet signal to dry signal.
Main Level This parameter controls the level of the Main Output (pitch- shifted output) from the H949 units.

Working with the Harmonizer®

3.1 Playing the Harmonizers with a MIDI Keyboard
A MIDI keyboard set to send MIDI on the H949’s MIDI Channel can be used to control the pitch ratio in discrete musical steps. Middle C on the keyboard will set Unison on the Harmonizers; 1.000 on the display. Playing the E above Middle C will produce a harmony of a Major 3rd. Playing the E-Flat above Middle C will produce a Minor 3rd and so on. Refer to the graphic below and the chart on the following page.

The Harmonizers respond to MIDI Note On and Pitch Bend messages. The bend range covers two octaves, from 0.500 to 2.000. The MIDI response for all plug- ins is OMNI,  i.e. messages received on any of the 16 channels will be accepted.
Figure 3.1: Pitch Ratio Readouts for Various Musical Relationships

NOTE
The lowest available For use each figure octave is only with the H949. ith the H910. round to 2 decimal places.

0.| 0.| 0.| 0.| -14
0.| 0.| 0.| .420| -15
380| 0.| 0.| 0.| -16
0.| 0.| 0.| 0.| -17
0.| 0.| 0.| 0.| -18
.320| 0.| 0.| 0.| -19
0.| 0.| .310| 0.| -20
0.| 0.| 0.| 0.| -21
0.| 0.| 0.| 0.| -22
0.| 0.| 0.| 0.| -23
| | | .250| Two Octaves

3.2 Preset Bar

Located at the top of the H949 Harmonizer® Plug-In, the Preset Bar lets you load and save presets, along with several other features.
When H949 Harmonizer® is installed, a library of settings is placed into the