That did the trick. Exactly as you said, I was using a wall wart that was 5V 2.4A wall wart (two usb-a plugs) to power the microrack. I tried two modern usb-c 20W and 45W warts and the envelope module no longer impacted the pitch. measured the VIN+ to GND- pins on the power module and the original wall wart showed 4.6V while the second two got between 8 and 12. One problem solved.
Another observation is that the pitch of the oscillator was about half an octave off between the old usb-A wall wart and the new usb-c ones. When I used the old wall wart and tuned the oscillator so the A key made 440Hz, the usb-c wall warts produced a note close to an E half an octave down. The oscillator is also back out of tune per octave, which was my original problem, but now I can fix that too thanks for Kevin’s article.
Thanks for the help @Nosnibor. @kevinjwalters You may want to update your oscillator tuning guide to include a first step of checking that the power supply is strong enough.