Frequency Central Loop/Env Generator - ADSR based on CEM3312/SSM 2056 by Digital Druid 2013 - Silver

Discontinued and unique module by the master Rick Holt at Frequency Central, this Jekyll & Hyde kind of ADSR can be angel and "evil" à la carte, performing usual envelope duties or bringing you some West Coast madness with the "loop" function. Here's what the manufacturer had to say about the Loop/Env:

"Flexible voltage controllable ADSR module based on Electric Druid‘s LOOPENV1 PIC, which is a digital clone of CEM 3312 / SSM 2056.

It offers CV Control over the envelopes complete time, Positive, Negative and Bi-Polar  Outputs. It is switchable between Linear and Exponential curves and can either be used as a traditional ADSR or in LOOP mode can function like an LFO (the different outputs come in very handy here especially the +/-), it can also go well up into the audio range in this mode. The Envelope is “snappier than a piranha jacuzzi” – minimum envelope times of 1MS, through to long envelope times – and everything in between!

3 modes (On/OFF/ON toggle):

• Toggle up = VCADSR
• Toggle middle = Gated looping (will only loop when there is a gate present)
• Toggle down = Looping , ie VCLFO

How the looping works:

• Sustain set to zero – cycles through the Attack and Decay only, the Release then sets the ‘off time’ – very cool.
• Sustain set higher than zero but lower than maximum – cycles through Attack and Decay until the Decay reaches the Sustain level, then it goes into Release. There are some superb weird waveforms to be had here.
• Sustain set to maximum – cycles though Attack and Release only. Decay sets the ‘on time’ ie how long it holds high after Attack but before Release.

Attack, Decay, Release min/max: 1ms – 10s (per segment)
Max freq in loop mode 310Hz
Max triggering speed 950Hz"

As these modules came in PCB+panel bundles, at the time, I personally made, calibrated and tested this module that has been sitting in my desktop eurorack system since 2015. However, since the rack sits in my studio and I'm mostly on the road, it hasn't seen much usage up to these days, so that explains why I'm letting it go.

Hyper-slight rack rash within the rack ears, other than that, it's in tip-top shape and fully, perfectly working.