Hey Tiido!

That’s a great spot! On mine, it looks like it has been simplified to R70 and R69, with the spot where R68 should be actually being a bridge to ground.

I lifted 70 and 69, and cut the bridge, but alas no change. Odd! I’ve put them back now anyhow.

It may remain an unsolved mystery… at least it does seem to otherwise work, and the SYSex above fixes some of those issues too!

I must thank you for your continued efforts on this, as well as your patience with myself- it’s very much appreciated 😀

I picked another one of these up, and it just so happened to be the earlier revision with the socketed CM-32L ROM. I did the mod again and observed the same results; no SFX on channel 10 unless you load in the SysEx file I made.

I did at least discover that the VPP doesn't need to be tied to VCC - I left it floating and it works absolutely fine.