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Skis II is a dual voltage controlled decay envelope with a dual VCA.
Both envelopes and VCAs are normalized, but they can be used independently. The decay envelopes are exponential, and they can also be set up as release envelopes. Both VCAs are linear.
A typical application of Skis is to take two signals (noises, for example) and generate percussive sounds with adjustable DECAY from them with a TRIGGER signal.
Skis II is a complete makeover of the original Skis module. It has a more robust and cleaner VCA architecture, a new dynamic voltage controlled decay envelope, and a few more little tweaks.