Hola.
Yo he utilizado el decodificador vs1033 de VLSI y me parece que tiene asombrosas prestaciones:

² Decodes MPEG 1 & 2 audio layer III (CBR
VBR ABR); layers I & II optional;
MPEG4 / 2 AAC-LC-2.0.0.0 ( PNS);
WMA4.0/4.1/7/8/9 all profiles (5-384 kbps);
WAV (PCM IMA ADPCM);
General MIDI / SP-MIDI format 0 files
² Encodes IMA ADPCM from microphone
or line input
² Streaming support for MP3 and WAV
² EarSpeaker Spatial Processing
² Bass and treble controls
² Operates with a single clock 12..13 MHz
² Can also be used with 24..26 MHz clocks
² Internal PLL clock multiplier
² Low-power operation
² High-quality on-chip stereo DAC with no
phase error between channels
² Stereo earphone driver capable of driving a
30­ load
² Quiet power-on and power-off
² I2S interface for external DAC
² Separate operating voltages for analog,
digital and I/O
² 5.5 KiB On-chip RAM for user code / data
² Serial control and data interfaces
² Can be used as a slave co-processor
² SPI flash boot for special applications
² UART for debugging purposes

Lo puedes encontrar en esta pagina:
http://www.vlsi.fi/vs1033/vs1033.shtml

Saludos

Valla, pues me gustaría que comentaras por aqui tus pruebas con este chip y que proyecto has hecho con el. Si tienes fotos no dudes en madarmelas y las pondré en la galería
Saludos.