OK thanks, probably right... how could I tell which version it is?
Also what would be the best way to make these files playable with least possible quality loss? I opened up the aac file in Audacity and took a look at the spectrogram, looks like it's about 34 kHz. I tried transcoding it to mp3 q9 (worst) and it cut the audio way down to 22 kHz and doubled the file size :'(
Ogg q0 (worst) was better, cutting it to 30 kHz and increasing the file size by 50%.... any other ideas? thanks