Parameters 6 & 7 set the attack and release shapes of the envelope respectively, from an
exaggerated exponential curve at 0 to an almost linear shape at 32.
Pushing the Z knob has the same effect as triggering both envelopes via the X & Y inputs.
MIDI Input: Any MIDI note messages received on the MIDI channel set in the Settings trigger
envelope A; any MIDI note messages on the next channel up trigger envelope B.
E-4 Stereo Compressor
Video
X is left input
Y is right input
A is left output
B is right output
Z is compression ratio
Parameter Min Max Default Description
0 -36 0 -12 Threshold.
1 0 99 20 Attack time.
2 0 99 20 Release time.
3 -1 36 0 Make-up gain.
4 0 99 0 Lookahead.
This algorithm implements a fairly traditional stereo compressor.
X & Y are the stereo audio inputs; A & B are the stereo audio outputs.
The Z knob/CV sets the compression ratio, from 1 (no compression) at fully counterclockwise, to
infinity (effectively limiting rather than compression) at fully clockwise.
Parameter 0 sets the threshold level above which compression applies (in dB).
Parameters 1 & 2 set the attack and release times. The attack time range is approximately 0.1ms-1s;
the release time range is approximately 1ms-3s.
Parameter 3 sets the make-up gain (in dB). If set to -1, the make-up gain is calculated automatically
from the threshold and compression ratio.
Parameter 4 sets a lookahead time, effectively delaying the audio slightly relative to the envelope
detection. This can be used to ensure that sharp transients are not lost during the attack time of the
envelope. The maximum lookahead is about 10ms.
E-5 Side-chain Compressor
Page 47
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