1222 VCO v 1. 1/2 (eurorack)

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and the AS3340A chips I’ve tested seem immune too

No, they’re not:

1222 Tuner VCO Module fixes/improvements

I’m back to looking at this and not sure what I’m doing differently, but… I’m definitely seeing the PWM frequency shift with an AS3340A. At least if it’s powered as (or rather, like) in the datasheet, with -12 V via 680R to pin 3. If I connect a regulated -5 V to pin 3 then the frequency shift is maybe gone or maybe just very much reduced. (I also find the CV scaling changes, so if I just switch the power without adjusting the tracking trimmer I get very much different frequencies.) I need to lo…