I hooked up one of the 3.5mm jacks that I had (although I want a smaller profile device) and used the simple toneMelody code for the Arduino. It worked but now I'm thinking that a pot might be advisable for adjusting the volume. I got to thinking about that too and I'm going to have to dust off the research tools to re-think the connecting circuit. Methinks that some resistors are going to be needed and an added pot might affect that in some fashion... ;)

Bob would be impressed that I'm using resistors. :)

This page will help me in my quest: http://www.rane.com/note109.html (opens in new tab)