dustydevices Phaser DDL Emulates The Ensoniq User Manual
- June 13, 2024
- dustydevices
Table of Contents
dusty devices Phaser DDL Emulates The Ensoniq
Product Information
The Phaser-DDL is a VST/AU plugin that emulates the Phaser-DDL algorithm from the Ensoniq DP/4 parallel effects processor. It was created by Jon Dattorro, Bill Mauchly, Dave Andreas, John O. Senior, Tom Metcalf, and Bill McCutcheon. The plugin combines a stereo 12-pole phaser with a delay, which feeds back into the input of the phaser. It provides accurate emulation of the Ensoniq DP/4 with parameter settings interpolated for more adjustment freedom.
On/Bypassed
The plugin is active when set to “On”. When set to “Bypassed”, the plugin
lets the signal through without applying any processing. The emulation is not
being run in Bypassed mode. The LFO phase and delay buffers are only updated
when the device is set to On.
Input Gain
The Input Gain controls the gain of the incoming signal before processing.
The default setting is -12 dB to allow more headroom in the processing. The
Ensoniq DP/4 (and thus Phaser-DDL) uses 24-bit fixed-point arithmetic, so any
input signal that exceeds 0 dBFS will clip internally. Even if the input
signal does not exceed 0 dBFS, the effect algorithm can still cause peaks in
the processed signal that exceed 0 dBFS internally and therefore clip.
LFO Phase S & H
The LFO Phase S & H toggle controls whether the phaser modulation is in or
out of phase.
Rate
The Rate parameter controls the LFO sample and hold rate. It determines the
rate at which the LFO modulation is stepped. The range is from Off (minimum
knob position) to continuous 0.01-100. The LFO rate can be synced to tempo by
enabling the sync toggle below the rate knob. To the left of the toggle is a
phase offset adjustment with a range of 0-360 degrees.
Width Center
The Width Center parameter controls the excursion amount of the phaser
notch modulation. The range is 0-99. The LFO rate can be synced to tempo by
enabling the sync toggle below the rate knob. To the right of the toggle is a
phase offset adjustment with a range of 0-360 degrees.
Phaser Feedback Notch Depth
The Phaser Feedback Notch Depth parameter controls the depth of the phaser
notches. The range is +/- 99.
Delay Left Time & Right Time
The Delay Left Time and Right Time parameters control the delay length of
the left and right channels, respectively. The range is 0-1600 ms. The delay
times can be synced to tempo by enabling the toggles below the knobs. Dotted
values represent triplets.
Feedback
The Feedback parameter controls the amount of feedback. The sign of the
value determines the polarity. The range is +/- 99.
Output Mix Gain
The Output Mix Gain parameter controls the dry/wet signal mix. A setting of
0 is 100% dry, and a setting of 99 is 100% wet. The range is 0-99.
Soft Clip Sample Rate
The Soft Clip Sample Rate parameter limits the output to -0.1 dBFS after
applying the output gain using a soft clip algorithm. It simulates different
sample rates at which the effect algorithm can be run. Resampling causes
characteristic aliasing in the frequency spectrum, similar to the original
Ensoniq hardware. Differentsample rates also affect the resulting frequency
extremes of the phaser notches and peaks, as well as the unsynced rates of the
LFO and LFO Sample & Hold.
Host
The Host parameter allows you to select the sample rate of the plugin. The
available options are 44.1 kHz, 35.7 kHz, and 29.7 kHz.
Product Usage Instructions
- Load the Phaser-DDL plugin into your VST/AU host software.
- Set the On/Bypassed toggle to “On” to activate the plugin. Set it to “Bypassed” if you want to pass the signal through without processing.
- Adjust the Input Gain to control the gain of the incoming signal before processing. The default setting is -12 dB.
- Toggle the LFO Phase S & H to determine whether the phaser modulation is in or out of phase.
- Set the Rate parameter to control the LFO sample and hold rate. Adjust the knob from Off to a continuous range of 0.01-100. You can sync the rate to tempo by enabling the sync toggle below the knob.
- Adjust the Width Center parameter to control the excursion amount of the phaser notch modulation.
- Control the Phaser Feedback Notch Depth to adjust the depth of the phaser notches.
- Set the Delay Left Time and Right Time to control the delay length of the left and right channels, respectively.
- Use the Feedback parameter to adjust the amount of feedback. The sign of the value determines the polarity.
- Adjust the Output Mix Gain to control the dry/wet signal mix.
- Set the Soft Clip Sample Rate to limit the output to -0.1 dBFS after applying the output gain.
- Select the desired sample rate using the Host parameter.
Introduction
- Phaser-DDL is a cycle-accurate emulation of the
- Phaser-DDL algorithm from the parallel effects processor Ensoniq DP/4, created by Jon Dattorro, Bill Mauchly, Dave Andreas, John O. Senior, Tom Metcalf and Bill McCutcheon.
- Phaser-DDL combines a stereo 12-pole phaser with a delay, which feeds back into the input of the phaser.
- All parameters (except for the Input and Output Gain) use the same range and units as Ensoniq DP/4. Parameter settings between two integer values are interpolated for more adjustment freedom.
On/Bypassed
The plugin is active when On. While Bypassed, the plugin lets the signal
through without applying any processing. The emulation isn’t being run while
Bypassed. The LFO phase and the delay buffers are only updated while the
device is set to On.
Input Gain
Gain of the incoming signal before the processing.
Note : Default is set to -12 dB to allow more headroom in the processing. Ensoniq DP/4 (and thus Phaser-DDL) uses24-bit fixed-point arithmetic, so any input signal that exceeds 0 dBFS will clip internally. Eventhough the input signal might not exceed 0 dBFS, the effect algorithm can still cause peaks in the processed signal that exceed 0 dBFS internally and therefore clip.
LFO Phase
Toggles whether the phaser modulation is in or out of phase.
S & H
- LFO sample and hold rate. Controls the rate at which the
- LFO modulation is stepped. Range Off (minimum knob position) and continuous 0.01-100.
- The LFO sample and hold rate can be synced to tempo by enabling the sync toggle below the rate knob. To the left of the toggle is a phase offset adjustment, range 0-360 degrees.
Rate
Controls the rate of the phaser notch modulation. Range 0-99. The LFO rate
can be synced to tempo by enabling the synctoggle below the rate knob. To the
right of the toggle is a phase offset adjustment, range 0-360 degrees.
Width
Controls the excursion amount of the notch modulation. Range 0-99 .
Center
Controls the center frequency of the notches. Range +/- 99.
Note : Originally in Ensoniq DP/4 the polarity of this parameter is reversed, higher values resulting in lower center frequency.
Phaser Feedback
Controls the amount of feedback. The sign of the value determines the
polarity. Range +/- 99.
Notch Depth
Controls the depth of the notches. Range +/- 99
Delay Left Time
Delay length of the left channel. Range 0-1600 ms.
Right Time
Delay length of the right channel. Range 0-1600 ms Delay times can be
synced to tempo by enabling the toggles below the knobs. Dotted values are
triplets.
Feedback
Delay feedback amount. A negative amount reverses the signal polarity. A
setting of 0 disables the delay. Range +/- 99.
Output Mix
Controls the dry/wet signal mix. A setting of 0 is 100% dry, a setting of 99
is 100% wet. Range 0-99.
Gain
Gain of the outgoing signal after the algorithm. Range +/- 24 dB.
Note : Default is set to +12 dB to compensate for the added headroom in the Input Gain stage.
Soft Clip
Limits the output to -0.1 dBFS after applying the output gain using a soft
clip algorithm.
Sample Rate
Simulates the different sample rates at which the effect algorithm can be run.
Resampling causes characteristicaliasing in the frequency spectrum found in
the original Ensoniq hardware. Different sample rates also have an effect on
the resulting frequency extremes of the phaser notches and peaks, and the
unsynced rates of the LFO and the LFO Sample & Hold.
Host Resampling is not applied. The algorithm runs at the sample rate of the host software.
- 44.1 kHz: Resamples to 44100 Hz, used in Ensoniq ASR-10.
- 35.7 kHz: Resamples to 35720.9 Hz, used in Ensoniq DP/4.
- 29.7 kHz: Resamples to 29761.9 Hz, used in Ensoniq ASR-10.
Note : Resampling causes 13 samples of latency on the output. Both dry and processed signals are resampled, sousing the Mix control will always result in a correct in-phase signal mix. It’s a good idea to keep this in mind, since the host might not always compensate for the latency automatically when Phaser-DDL is used as a send effect, for example. When Sample Rate is set to Host, the latency is 1 sample.
Another note: The plugin is designed to work with a sample rate of 44.1 kHz or higher. In case you’re running your host at a lower sample rate than 44.1 kHz, Phaser-DDL will not do any processing and will effectively bypass itself instead.
**** Jon Dattorro, Bill Mauchly, Dave Andreas, John O. Senior, Tom Metcalf and Bill McCutcheon for creating theEnsoniq DP/4 and all of its effect algorithms. Markus Pyykkö / electrontu.be for reverse engineering and writing a custom ES5510 emulator. Max Huttunen for porting to VST3/AU and his initiative. Pekka Kokkonen for alpha testing. Laatikko for being my rubber duck during development.
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