Schlappi Engineering Boundary - Black skiff and the WINDOW jack allows

and the WINDOW jack allows for selecting which of these notes appear at the outputs

This waveform then enters the Thru Zero Amplitude Modulation (Ringmod) section

But here's where comparison stops

This VCA is meant to be used as 4 separate VCAs

Schlappi Engineering Boundary - Black skiff and the WINDOW jack allowsThe Boundary is a multi purpose modulation and signal control center. It consists of a cycling slew and a four quadrant multiplier (VCA). The cycling slew (which can be used as an envelope or LFO) has individual control over rise and fall, rate and shape, as well as dedicated inputs for trigger, slew (for gates or pitch CV), full wave rectification (for envelope following), and a unique BOUND input which allows for bouncing ball effects and additional