vc audio mixer

Mark Verbos heeft een heel simpele crossfader, die gebruik maakt van twee vactrols.
Op zijn site (www.simple-answer.com/DIY.html) staat het volgende schema:
http://www.simple-answer.com/vac-crossfader.jpg
De beschrijving:
There are times you'll need to crossfade between two sources. One example is to sweep between to waveshapes from an oscillator. This circuit uses Vactrols, eliminating the extra noise of OTA based circuits. There is a similar circuit in the 207 mixer, for the voltage controlled panning. The 207 uses VTL5C3/2 Vactrols with a 47k resistor to ground comming from the center tap and a 10k to ground after the vactrol. This makes a double attenuator, and may give a nicer pan curve with no gap in the middle. That circuit is also below.
 
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