The wildest and most "out there" feature in this audio processor is, of all things, the master stereo gain control which is the 10k multiturn pot in the middle of this schematic. Yes, a single track variable resistor and no, it isn't a DC volume control.
@synx508 by which I mean, how the heck did they control the volume of the other channel...
@RueNahcMohr When the unmolested side gets dimmed by the balance control, the inverted "not balance" or "getting louder" side is sent to the diff amp of the other channel which also makes it quieter.
@synx508 @RueNahcMohr is it shorting the input side of each op amp slightly to ground, but on a divided basis?
@u0421793 @RueNahcMohr Yes, the series resistors feeding the gain control mean it can't ever turn the volume down to nothing but if you took them out it could. The extra bonus weirdness is that if you adjust the 100kΩ calibration pot incorrectly the right side will turn down and then turn up again in antiphase, which is quite exciting.
Philip Bragg
Rue Mohr
Ian