I started going through the VCO section of the manual and testing with the 3V C playing over and over.
Looks like I'm getting some incorrect values. Specifically, R90, which should be reading that same 3V, is reading 5.33 volts (unless I'm misunderstanding that measurement), though pin 7 of the op-amp is reading the correctly at 3V.
Also, the DC bias for my saw wave is reading 10.33, not 8.5 (this check here: http://www.ladyada.net/images/x0xb0x/fa ... eter_t.jpg
Some things are testing correctly though. The tests higher up on that page in the manual (5.33V and 12V tests at the diode and IC) are testing perfectly. Just for whatever reason the VCO is generating very high frequencies. My 3V C is generating 535 Hz on the waveform switch (edit: I've had it on running C notes since this post, and now it's measuring 430Hz, quote possibly something wacky with the multimeter, but it's definitely way higher than it should be just by ear).
Am I testing the correct place on that switch? I have the switch on saw, and am testing this pin: