The M1 software synthesizer provides all of the PCM, Program, and Combination data found in the original M1 and the M1EX internal PCM expansion, plus the PCM data and Program/Combination data from all nineteen optional ROM cards. DATE : 2017.09.30 | NUMBER : R2R-6307/6308 | SiZE : 9.4 MB/13.7 MB PLATFORM : WiN32/64 - EXE/VST/RTAS | MacOSX - APP/AU/VST/RTAS The M1 software synthesizer is a complete stand alone virtual instrument and also supports RTAS, Audio Units and VST plug-in formats to fit smoothly into a modern music production environment.