Bender Sequencer Idea

I had an idea for a sequencer that can be used with circuit bent devices. I designed it around a 555 timer and the 4017 decade counter. I have used both of those parts for years to make blinky LED displays. I breadboarded a prototype and have started designing a cool enclosure for it. I did a search online for sequencers and found that there are several designs out there. However, they are all built for integration into a modular synthesizer. What I want to do differently is to make a circuit specifically for use on bent devices. So, I redesigned the circuit so that it is isolated from the device being bent using optocouplers. The idea is that you can install a jack in the bent device where you would normally install a pitch bending potentiometer, then use the sequencer to control the pitch bend. More on this as it develops.