"A simple and inexpensive device is described which allows selecting and mixing audio channels by control voltage. The circuit takes advantage of the low self-noise of analog photocouplers. The slow response time of the phosphour is used to integrate the pulse width modulated LED drive. Channel crossfading is accomplished by adding a "dither" signal to the comparator string, producing apparent linear crossfades between audio channels."via Music Synthesizer where you will find more Synth DIY. VCEOM page.
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