CS-80 Calibration Part 8: Tremolo/Chorus

This step is also kind of straight forward. The OE1 and OE2 boards have to be taken out together.

OE1 Board

All VCA levels on all M-boards should already be adjusted properly before doing this part.

Otherwise there will be different readings on Step 4 (Modulation VCA Gain) every time a key is hit, all depending on the VCA level of that voice board currently playing. This will make it hard to adjust, because of ending up with different levels.

OE2 Board

Step 2 where I was asked to adjust between 7 - 12.5µs for lowest noise is not clear to me. Besides some variation in the idle modulation I didn't hear any noise change or noticed anything I should watch out for. I only started to hear some noise when I was outside of that range. I just chose the idle modulation I liked best. :)

After I finished calibrating the OE boards I was somewhat disappointed when I ran a quick testdrive. I never really liked how the tremolo or chorus section sounds when I switch the tab of that section on (the sound color changes by just enabling it, without even switching chorus or tremolo on. I hoped it would just be a calibration issue, but unfortunately it wasn't.

Well, the good side is, since that IG00150 died on the PRA and the OE1 board has two of them, so I conveniently had some spare parts I could use. :)

Continue to Part 9: Touch Response