I first tried to create a solid internal feedback loop and go from there, but the technology crammed in some of these things make altering the circuit pretty difficult. I was able to make two alterations that make this thing squeal and sputter pretty nastily as long as you have it in a feedback loop. Preferably a mixer feedback loop, or at least one with an EQ pedal. Testing the volume and gain knobs on the pedal with an EQ in the loop is what brings this to life. You'll get the most "action"when the pedal's knobs aren't up all the way and you are not feeding the signal chain a ton of the pedal's signal. Basically, you can experiment on your own, but after messing with this thing for an hour, I've found it's sweet spots. Which you can do as well. It will generate sound without an input but it's basically just hiss or a boring oscillation tone.