My breadboard rig

[DrNomis_44]

Your setup sounds a lot more sophisticated than mine. My only diagnostic tool is a DMM from Jaycar. I have built 4 pedals so far this year, but I am really only just getting into this hobby, trying to relearn some of what I knew when studying electrical engineering (before dropping out) 30+ years ago.

An oscilloscope and an adjustable oscillator for driving the input would be invaluable for testing, tweaking and debugging audio circuits though. I am quite green with envy!

DC

Yep, I do happen to have an old Dick Smith Electronics 20Mhz dual-trace oscilloscope, which I bought back in 1998 or so, got an even older Telequipment Scope in a cupboard in my studio room, it needs a bit of restoration work done on it and a replacement CRT to get it working, I do need to build a good audio Sine/Square wave generator too.

I've got the basic design for my breadboard power supply worked-out in my head, just need to buy all the bits and pieces to build it and then I'll be able to get cracking with the modular synthesizer build.

Also need to buy two new scope probes and a good logic probe for de-bugging digital circuits, digital electronics isn't really my forte, analog electronics is what I'm better at than digital, although I know some digital electronics theory.

If you have a look on eBay, you might be able to pick up a decent 5MHz or 10MHz single-trace oscilloscope for maybe $200 or so, those are fine for audio testing/debugging work, make sure it's rated to work on our Australian 240V AC mains though.