Yes you could. The idea behind it is really routing a "play" button as the doorbell button.
You could get a computer your not really using. Get winamp on it, grab a plugin that lets you make your own remote control via serial port. Make a button, wire it up to the outside. Then put the computer speaker where you want.
I actually did something very similar. I used a broadcast cart machine. Those things are perfect. The cart tape itself is in a loop and the machine drops cues on the tape so it automatically stops at the beginning of the recording. It works pretty nice.


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