[sdiy] Simple (?) sequencer mod for syncopation

[Aaron Lanterman]

On Jun 4, 2009, at 2:48 PM, David G. Dixon wrote:

> Now, coupled with these thoughts, I have just been reading Allen  
> Strange's
> book, "Electronic Music: Systems, Techniques, and Controls (1972  
> ed.)."  In
> the excellent Chapter 6 on "Gating" (page 44) he talks about something
> called "pulsed mixing."  In this technique, one takes a pulse wave,  
> isolates
> the positive and negative parts, and uses them separately to gate  
> two VCAs
> processing different signals, causing anything from a jarring "ping  
> pong"
> effect to a seamless blending of the two.  I find this very  
> intriguing.

Believe it or not, the Buchla 257 Dual Control Voltage Processor uses  
this idea to CV crossfade of two signal. It has a high frequency  
oscillator that controls two CMOS gates that gate each of the signals  
alternately on and off, and then runs that through a boatload of  
filtering. The pulse width of the high frequency oscillator controls  
the amount of each signal that is mixed in. It's really freaky. I'm  
seen things like that in AM transmitters and such but that's the only  
place I recall seeing it in a synth circuit.

- Aaron