But you said memory... Mp3 and Ogg are expanded in memory before/during playback. The only way to reduce memory consumption is to either stream from disk or to encode at a lower bandwidth - ie. 16Khz file is 50% less than a 32Khz file and 16Khz Mono is 25% size of a 32Khz Stereo file. Remember disk space used does not equal memory used.