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What i do is this: I have couple of keyboards and modules, i record them in different passes, but i only have 2 mono inputs available, so i need a line mixer or some sort of switcher to choose whichever module or keyboard i want to record and be able to solo it so that i can record it on the fly (or via midi)
Actually i already have lots of gain from the outputs of my keyboards, do you think merging them with hardwiring won't cause any impedence problems?
If I understand you right, then you don't actually want to mix or merge at all. You just want a convenient way to patch them up as required?
That's what a patch bay is for. Although with unbalanced cables, a little rotary switch box (as used for hifi components) can work well.
Avoiding active circuitry can avoid noise. Unless you also need impedance matching or gain/attenuation, you can't beat the performance of straight wire. Or the nearest thing to a straight wire.