I found this (I was checking how to make a lo fi freeze)
https://www.reddit.com/r/diypedals/comments/1tby5z/ehx_freeze/I want to use it with a isd1820 but I don't know how exactly works a transistor switch and how to make it go fast. It's something like a request, but since I have no schematic and no idea on it should work I thought I should have posted it here.