X is the audio input.
Y sets the filter frequency, with a 1V/octave response. The 0V point is C3 (approximately
130.81Hz). Parameter 0 is added to the Y CV; its range of ±80 corresponds to ±5V.
Z controls the filter resonance.
E-1 AR Envelope
X is trigger input
Y is trigger input
Z sets the envelope times
A is envelope output
B is envelope output
Press Z to trigger
Receives MIDI
Parameter Min Max Default
Description
0
0
2
0
Trigger Mode.
1
0
1
0
Z Mode.
2
-40 41
32
Output A Attenuverter.
3
-40 40
32
Output B Attenuverter.
4
-40 40
0
Output A Offset.
5
-40 40
0
Output B Offset.
6
0
32
26
Attack shape.
7
0
32
10
Release shape.
This algorithm is a two-stage (attack/release or attack/decay) envelope generator.
Inputs X & Y are trigger inputs. A signal in excess of 1V on either input will trigger the envelope,
according to the mode set by parameter 0. In trigger mode 0, the envelope will rise to full level and
stay there as long as the input is high (AR mode). In trigger mode 1, the envelope will execute one
full attack/decay cycle in response to a trigger input (AD mode). In trigger mode 2, the envelope
will continually execute attack/decay cycles as long as the trigger is high (looped AD mode).
Z sets the envelope times, according to the mode set by parameter 1. In Z mode 0, the full range of
Z values sweeps from short A & D, through short A & long D, through long A & D, through long A
& short D, and finally back to short A & D. In Z mode 1, Z sets the A & D times to the same value,
from very short times (about 10ms) to very long times (about 8s).
A & B both output the envelope CV. Each has its own attenuverter parameter, which can attenuate
and/or invert the signal. The maximum envelope level is 10V, with the default parameter value of
32 giving an 8V envelope. Each output also has an offset parameter, which can move the whole
envelope up or down by up to 10V.
If parameter 2 is set to the special value 41, output A becomes an end-of-cycle trigger output,
generating a 10ms 5V pulse at the end of the envelope's release stage.
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 the envelope via the X or Y inputs.
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