MESS v0.134 SVN r6112 is released.MESS is a free emulator which emulates a large variety of different systems.

MESS SVN Changelog:
r6109
Improved mono audio decoding; Hotel Mario's intro sounds better, though still poppy due to some sort of glitching on sector boundaries, don't know why.
r6110
[CDI] Rudimentary Level A ADPCM support, produces intelligible but duplicated results. [Harmony]
r6111
[CDI] Greatly improved Level A ADPCM emulation, only issue is the same distortion as with Level B and Level C [Harmony]
r6112
[CDI] Miscellaneous updates: [Harmony]
- Now properly masking off the low 2 bits of CLUT entries, mask values and transparency values
- Added stereo Level A support, commented out because it doesn't currently work
- Fixed up region array processing, Richard Scarry's Best Neighbourhood Disc Ever not showing anything, and Zenith having a bad ball shadow.

Download: MESS v0.134 SVN r6112
Source:Here