A pre-amp with multiple simultaneous outputs.

Is there a pre-amp that can play muliple line level outputs simultaneously. I've found many commercially available re-amps that have multiple outputs, however, they only can drive 1 output at a time.

I am attempting to link 2 pre-amps (1 upstairs, 1 in the basement) to a main pre-amp located in the main room so that the pre-amps upstairs and downstairs can either select the output from the main pre-amp or select a local input. The pre-amps are connected with 18 guage 2 conductor wire run not more than 120'.

If it cannot be done with a pre-amp, is there another solution?