I use the Harmony-M and for me it works very well. You can listen to a sample of me using the Harmon-M and playing with the PSR-3000 at PSR Tutorial . I recorded the songs using the Zoom II plugged into the keyboard's headphone jack. The mic I used is the Crown CM-311A headset mic. All of the effects are generated by the Harmony-M. There is no editing of any kind--it's a one shot deal while I was at work at one of the nearby assisted living centers. The song that represents the vocal harmony from the Harmony-M is Alabama's "Feels So Right."

Good Luck,

Gary