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Old 4 weeks ago
Lives for gear

A resistor network is a simple passive mixer.

The size answers really depend on the output impedance of your preamplifiers and the input impedance of the ADCs. For many line level applications, the input impedance (perhaps 10 kOhm) is much, much greater than the output impedance of the drivers (perhaps 150 Ohms). 100 Ohms is probably lower than you want; 1 kOhm resistors might be a reasonable starting point. Trial and (possible) error are perhaps the best way to figure these things in practice.

If you're only ever using one at a time, you can instead have a switch or patch bay or even just move cables around. That would generally be preferable to a passive combiner circuit.