M1.XML 20120521 is released. M1.XML file for use with M1 - keeping up with changes in MAME. M1 plays the music from arcade games by running the code in the original ROMs (not supplied). This allows entirely authentic playback of classic video game tunes while you work.

M1.XML 20120521 Changelog:
Simply a maintenence release to data sync to MAME 0.146.
No adds or renaming should be needed.

Download: M1.XML 20120521
Source: Here