As I haven’t been at all happy with the clap option that I have currently, I’ve built a better one. Basically a straight clone of the 909 clap with some additional parts of the noise circuit exposed to front panel controls.
It didn’t work at all when I finished it. I realised this was probably down to the cheap nasty ceramic capacitors I’d used (I just used what I had in stock). I switched these all out for good quality audio grade poly caps and it was all good, if a little noisy!