Which exactly CPU is it? Reason I ask, is I’m considering taking the PCB files and making some changes to try and make it smaller to fit my needs better. If I do real carefully I should be able to use a very fine tip to solder the leads on for the CPU.
I’m also contemplating trying to add a single 7-segment character display, or https://www.adafruit.com/product/870 matrix display to make for easier visual reference for the settings. Or even just a few LEDs to give a single number (yay binary!) I can never remember which setting it’s on, and rotating through everything and trying to keep track of the LEDs that come on for just a quick flash is a PITA for me.
BTW, what are those 4 through holes just above R9? They don’t seem to be documented anywhere.