One more thing. I tried reinstalling C17, but then the original symptoms that I first posted about reappeared. However, without C17, it operated just fine, so I just removed it again. Something in that circuit is still causing an issue, but only when the circuit is wired in. I think I know what the silencing circuit is supposed to do, but it doesn’t seem vital to my needs. I’ll happily live without it. I put it all back together, and the tremolo sounds great.
Thanks again,
Peter