OK, I did some tests, here are results: 1. Reaper as the master, method with MTC code time generator: (extra track). 2. MPC as the slave (30 framerates). it's very tight, and working. Clock (Ctrl+P - Midi dev) disabled. I recorded 2 tracks at the same time: MIDI and Audio from MPC. I did it twice. To get proper sync, you have to shift Time Code Generator item on the track -> right -> to position (time) 0:00.057 (instead of 0:0.0) - where MPC starts playing, to have perfect match. Midi notes are in right place, and audio notes are at the right place then. I did 2 trays. Both have perfect match in audio and midi tracks. If you have another sequencer to sync, good method is arm 2 tracks at once: midi and audio and record 2 tracks from sequencer to DAW when synchronized, and then check out the ruler. Best regards and thanks for help. First week of testing Reaper was succesful. Regards Adam