[letterboy1]

I have mostly mp3 files in my gramophone and they play fine. There are probably other standards (parameters) that have to be met such as sample rate and bit rate, but I'm not sure what the minimum/maximum levels are yet. Every now and then I search the forums to see if anyone has discovered what limitations the developers actually programmed into the gramophone . . . maybe I'll think to e-mail the devs some time and ask them.

Most basic .wav -> .mp3 conversion programs give you default levels like 128kbps (bit rate), 44.1 KHz(sample rate - often simply listed as 44 KHz), and 16 bit resolution. These seem to work in the gramophone. Alot of my own conversions are at a sample rate of 192 kbps and that works fine, too. I'm not sure, but I believe that the gramophone will play both stereo and mono files as well.

Oh, and as was already mentioned, .ogg works. I've not tried .wav files yet, so I don't know if they work.