All, I tried to playback a wave file what was 16k sample and 16 bit data it does not play... using sox... I resampled to 8k and 16 bit data it plays but there is noticible loss in loudness. I resampled again to get 8k 8it gsm and it plays but there is additional background hiss introduced. Is there some way take the 16k 16 bit wave file directly so no degredation occurs? Jerry