I can comment on the Harmony-M, which is in my closet collecting dust. The SMF tracking is excellent for me with both a Yamaha PSR-S900 and S-910. I did have to create midi presets on the keyboard to use with SMF as well as style play. However, when using style play, triggering harmony from left hand chords, it is just absolutely terrible. I also have a Vocalist VR, and do not have a problem with it, which leads me to think it is the Harmony-M that is the problem. I have tried all sorts of midi settings on both the Keyboard and the Harmony-M, and nothing helped. If all you are doing is using midi files, and not using style play, you could simply set the Harmony_M to the correct midi channel, usually 5 with commercial midi files, and forget it. However, the midi receive channel on the Harmony-M is global, and triggering the Harmony-M from style play may require a different midi channel. I have tweaked, and went back to using the built in harmonizer on the Yamaha, just for the simplicity. Gary

[This message has been edited by gcbin (edited 12-03-2010).]

[This message has been edited by gcbin (edited 12-03-2010).]