> Can anybody comment this and/or possibly point me at some good documents?
It looks kind of easy, although I've never gone there myself. After all, you just need to display two lines, one fixed (you omitted to mention that you need to specify the tone you are after) and one that moves closer or further from the base line as the tuning is adjusted. Two points may suffice, but they may be hard to read. As for the audio input, I seem to recall that the audio device delivers numeric values representing the sound, so all you need to do is keep reading, deleting a previous display and producing a new one as each sample is input. Am I being overly simplistic? It sounds almost like a trivial shell (rc) script, if you don't need the graphics. ++L
