to clarify what kind of instrument this is:
the switch is a part of a musical instrument, where each channel is one note, controlled by a keyboard.
there will be 12 stereo LM1876 amp chips, giving me 24 notes to play with. the outputs of the amp chips dont go to speakers, but rather they go to 24 coils that drive steel strings through magnetic actuation. (its a harp)
the solenoids drive the 24 harp strings by a feedback loop (the input is a piezo pickup, on the bridge - through a preamp)
i have made a similar instrument before, seen here :: ulfurhansson.com.
thats why i need to be able to turn the channels on/off very rapidly, through a digital interface (the arduino)!
so, clicks and pops are fine - they actually could help the strings to start vibrating.
i got the chips from fedex today - for some reason this setup is NOT WORKING
any thoughts on what i might be doing wrong?
here is the datasheet : http://semicon.njr.co.jp/eng/PDF/NJM2521_E.pdf