I seem to remember that some reverb block had a hardwired pot control in it.
If you can narrow it down to a problem in a specific block I might be convinced to take a look at it, but if it simulates correctly...
I haven't looked at SpinCAD code in 2 or 3 years.
Couple things come to mind though.
a) I think there is a problem with Delay Stages = 3. I never bothered to figure it out but I think there's maybe a phase flip that results in less reverb with 3 stages than either 2 or 4. If you look at Spin supplied reverbs IIRC they either have 2 or 4 delay lines, never 3.
b) Your pitch shifter feeds right back on itself. Other shimmers I looked at, I seem to recall that the feedback loop went through the reverb. I also did some stuff with a multi-tap delay.
Another strategy is simply to debug the Spin ASM. This is the sort of thing people used to contact me about and when I told them how much I charge for this sort of thing, I'd never hear from them again. I don't mean to be a jerk about it, just that it would take me several hours that I don't really have to even set up the development environment. Everything's in Github for the enterprising individual. Good luck!
