JTEX

I'd consider ditching the FET and using the op amp non-inverting. You can add a pad after it to drop the level as needed for the codec...

I honestly thought NTE had gone out of business years ago.

Might I ask why you're using an inverting topology?

The 5k to ground from the pot set at 50% is just as much a part of the circuit's output impedance as the other 5k from the op amp's...

@Tantalus: I didn't mean to suggest leaving the tone control in the usual place, I merely wanted to clarify that you can use a typical...

They're not the same. The one on the right does not work as a filter. Well, maybe it does, depending what follows it, but on its own...

Oh, ok, if you're already using 48V as the main supply, it makes sense to DC-DC it to +/-12 for other stuff.

On further reflection, I'd have to say that I wouldn't want to feed the pedal 48V. That would be a pretty unusual power supply that you...

Why not use a DC-DC module instead of a linear regulator followed by charge pump? 48V in, +/-12V out. There are plenty to choose from...

Any change of you pull your in/out wiring away from the pcb?

Best for audio path: up to about 47nF: C0G ceramic, or film (film caps tend to be larger, pricier and easier to damage while...

They might be down to around 50% of nominal capacitance at that voltage. That could very well still be fine in many decoupling...

Normally yes. In fact that's probably their best use case. Just be aware that their capacitance decreases significantly as the DC...