The 281e contains four indentical function generators (FGs) which fire an attack-decay cycle when receiving a pulse. After the cycle is finished a pulse is available at the pulse out.
Three modes determine the behavior:
- /\/\/: in this mode the AD cycle loops itself and we get an LFO. The attack and decay parameters not only control the waveform but also the frequency. A pulse at the input resets the LFO.
- /\ is an attack-decay envelope. The duration of an input pulse is ignored.
- /¯\ is an attack-sustain-release envelope. The duration of a pulse determines sustain length.
In quadrature mode which is activated with the green buttons, the FGs operate in pairs: A+B and/or C+D. The pulse input of the second FG in a pair is not used. The second FG will be triggered after the first has finished the attack stage. Attack stage works like a trigger delay.
The OR combiner at the bottom of the module mixes the signals of FGs A+B and C+D and blends between them. This function is int3eresting especially in the quadrature mode; #1 because of the delayed 2nd envelope and #2 because of the adjustable level relationship it is possible to generate multistage envelopes, e.g. similarto a classic ADSR. Use the first envelope as AD and the second as an ASR with lower level, this might do the trick.
Hint 1: patch the CV output into the CV input(s) of the time segments and change the curve form for this segment.
Hint 2: use the funtion generator as a clock divider: the length of the attack has to be longer than the time distance beteeen two clock signals.
Hint 3: In LFO mode the pulse output generates a square wave.
The setting of the potentiometers in the OR section can't be saved.
per channel: pulse input, attack CV in, decay CV in, pulse out, CV out
OR combiner CV outputs: for function generator pair A and B
4U Buchla form factor module, one panel wide (17.8 x 10.8cm or 7" x 4.25")
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