The Studio Electronics / Roland Boutique synth has a rather unusual envelope, which is kinda borrowed from the Moog Mini D.
It's not a clone of the Moog, though I thought it would be useful to compare the two.
The most common type of envelope is the ADSR.
It has 4 stages. The stages are:
Attack : is the time taken from nil to peak, beginning when the key is pressed.
Decay : is the time taken from peak to the sustain level.
Sustain : is the level during the main sequence of the sound's duration
Release : is the time taken from the sustain level to zero after the key is released
The Mini Moog D was unusual in that there were just 3 knobs to control a 4 stage envelope.
Most synths have 4 knobs.
Attack, Decay & Release are all time based.
Sustain is a voltage level. It is usually "flat" and does not
change during it's phase.
Usually the envelope starts with a signal from a keyboard or other source. It goes through the attack & release stages. When it reaches the sustain phase, it pauses and remains
there until the gate goes low (e.g., from the keyboard key being released).
There were two identical envelopes ... one for the filter, and one for the amplifier
The decay knob doubles as the release knob.
So the envelope can be seen as a ADSD envelope.
It's interesting though not surprising that Studio Electronics decided to use a similar envelope configuration.
My SE-MidiMoog (which is a rack mounted Model D) started this all off.
The SE-01 & SE-1X saw the return of that release knob, but the SE02 saw it's demise once again.
SE-01
Maybe the decision to drop this pot, was based on practical considerations like the lack of space on the Roland Boutique synths.
SE-02
So looking at the front panel of the SE 02 one can see we have 2 envelopes:
A Filter and a Amp envelope.
Neither envelope has a release knob. They both however share a release switch
which is in the the lower right corner.
It's settings are: 2, 1&2, OFF2 = The release stage is applied to the Amp
1&2 = The release stage is applied to both the filter & AMP
OFF = No release stage
Remember that the decay value = release value.
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About the other knobs & switches in the Filter/Envelope section:
Key Track
1/3 = The filter frequency changes by 1/3 of the pitch change.
2/3 = The filter cutoff frequency changes by 2/3 of the pitch change.
If both switches are on, the filter cutoff frequency changes by the same amount as
the change in keyboard pitch.
Contour
Adjusts the amount the filter envelope effects the filter frequency.
Normal / Invert switch
Specifies the polarity of the filter envelope that is controlled by the [CONTOUR] knob. If
this is set to “INVERT,” the polarity is inverted.
Mtrig switch
If this is on, the filter envelope restarts each time you press a key.
LFO/GATE
Specifies the signal that controls the amp envelope.
LFO: The LFO controls the amp envelope.
GATE: The Note or Gate controls the amp envelope
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