Adding Permanent Triggering
An Envelope Generator Modification
The internal trigger pushbutton caused difficulty when tuning the sequencers as it required re-patching to bypass the unit, biasing it on or an extra hand to hold the trigger button. My solution was to replace the trigger button with an ALCO # MST-1054 miniature toggle switch. This is a SPDT switch which "holds" in one direction and spring-returns from the other. By installing the switch with the fixed contacts tied together, the direction of travel being vertical and the momentary position downward, I can now test the sound of the note through the normal action of the ADSR by simply pushing the switch down and releasing it. Testing and setting pitch can be accomplished by pushing the switch up and leaving it. This, for my use, is a definite improvement.
Editors note: Although this modification was made to a 4740 Envelope Generator this idea will work equally as well in the 2720-4 Function Generator.