555 Oscillator mod
I added a couple of mods to my 555 oscillator:
1. a volume knob
2. a switch that jumps from "standard" astable mode (see previous video) to "pseudo trigger" mode, in which pins 2 and 6 on the 555 are connected via a momentary switch-- pressing the switch completes the circuit.
The layout (according to the orientation in the photo above):
Here's a video demonstrating the mods in action (w/ a Frostwave Resonator):