Hello,   If you want to see more simulations, post a clear schematic and I can give it a try.   Bertus

Are the two domes in this pic different greys (they look it on-screen)?   The finish looks great.   Is RAL 7024 the all-the-80s grey?    

Toying with this idea but wasn’t sure how it would turn out tbh but I think the led’s look pretty good - especially if Denzil is a static prop in the future. IMG_0025.mov    

Thanks @Trackhappy and @bertus . Really need these ideas. Plenty of improvements can be made. But I will need to fit it all into a bigger case. Just worked on this version of design to get a model out there for independant testing.   Can add a distortion board that has it's own op-amp. Then add a Bass tone board that has op-amp with 5 times the gain level. Need to go back to the paperwork with calculations for the Low Pass filter's. Maybe If I put the Low Pass network in front of the tone board. Then with a dashpot to go from 1 to 5 times the gain level. This way I can change the passive low pass and change it to active low pass by using the tone board op-amp.   Building an active Low Pass filter network has always been a weak area of my ability.