- What parts are needed to create a multi-pneumatic solenoid configuration where air can go to different horns at different times from the same compressor?
This 12V, direct acting, normally closed valve is what you're looking for. Even this $10 part is overkill; you'll only need a couple PSI of pressure if you're trying to match the capabilities of a human.I'd also recommend the quick connector fittings like are shown on the above page. This style of fitting can be found pretty inexpensively for elbows, Ys, flow control, etc., and don't forget to buy the tubing that goes with it.
Just curious - what are you using to provide the equivalent of vibrating lips to the brass horns? They need more than just air blowing in don't they?