This chip is a development of my earlier VCADSR envelope generator. Whilst that chip had both GATE and TRIGGER inputs, this chip replaces the TRIGGER input with a MODE CV that allows selection of normal ADSR, Gated looping, or full LFO-style Looping modes.
The LOOPENV chip keeps the other features of the original VCADSR, like the LEVEL CV which controls the output level and can act as an ‘envelope depth’ control, and the TIME CV which shortens the overall time of the whole envelope. The TIME CV makes an excellent modulation input for either envelope modulation or LFO frequency modulation.
The datasheet includes example circuit diagrams, example waveforms, and the chip pinout diagram.
There are also further details on the Looping Envelope generator project page.
Obsolete! This chip has been superseded by the EnvGen8
The new chip combines the features of the old LoopEnv chip, has improved resolution, and also no longer requires a crystal. It’s an improvement in pretty much every way! Head over and check out the data sheet.