so, iv'e been spending the last few weeks surfing the web on how to put audio-in jacks for the square waves, and triaingle waves on an NES, so i can plug a keyord,guitar, or what have you with a 1/4" jack into an NES, and all i have been able to do is the "prosound" thingy i keep reading about, which is basically adding a amp out jack on it, and it works fine, but i want the input to work too. . . : (
help please?? : (