I want to build a stereo channel strip, using the NE5532 IC. It should feature 2 mono inputs with volume control, mute switch and pan control going to a stereo output with unity gain. In the schematic you can see where I am with my design so far, however I'd have a few questions:
Are the capacitor and resistor values ok? As far as I understand, the NE5532 is an acceptably low noise IC for summing but doesn't like high resistor values; as for the capacitors, I've determined these values don't affect the audio signal within audible range, as far as I can see on my spectrometer.
Is it better to feed both left channels and both right channels through a resistor each (meaning, 2 resistors going to the inverting inputs of each op-amp) or is 1 resistor per op-amp input enough, as I've done here (R1 and R2)? My thinking was, less resistors, less noise.
Does the order of volume pot and mute switch in the signal path matter?
Is it better to put the pan controls before or after the op-amps?
Any suggestions are welcome, I'd be very grateful.
Thanks in advance