M1_all   - all factory data
M1_Fac_C - original M1 factory combinations
M1_Fac_P - original M1 factory programs

M1_GM1   - General Midi sounds 1...99
M1_GM2   - General Midi sounds 100...127 + additional sensual sounds
M1_GMmix - Mixture of most significant General Midi sounds + others
           best of collection from GM1 and GM2
M1_GMmixC- Combinations using the GMmix patches

GM_glo   - General Midi drumsets (global data)
GM_all   - all data

*.mid	Sysex contained in Standard Midi files
*.syx   pure sysex data

For more info see:
www.engon.de/sounds