I don’t have enough inputs on my Tascam 2x2HR to run MG-3 AND other stuff, but I do have an older Yamaha Audiogram 3 also a cheapie Behringer UCA202. Would a guitar connected to either of these and then MG-3 give adequate performance on my M2 Mac Mini? If it works well, I will consider swapping out my Tascam for a version that has more inputs.
As long the latency is within an acceptable range (up to 10-15 ms/round trip) I would say that the influence on the function of MG2/3 is neglectable, or what else do you mean with “performance”.