Hello All.
I have minimal circuit bend training. I once got a free Casiotone 120 (I think) and cut through the rhythm bus because it was in the way, trashing the whole Keyboard. I am not good. Luckily my school's music department has a fleet of retired Yamahas for me to bend away! I also like trashing a keyboard, as it makes interesting sounds whilst its dying.
I have one circuit bent instrument, my kit theremin. I found that touching metal parts can add an interesting modulation!