For the PSR-S950 and all other Yamaha keyboards, the keyboard's MIDI must be set to "KBD & Style" which is accessed via Function/MIDI. This allows the Harmony-M to recognize all chords played on the keyboard. Now, if UD is not using the lower (style) to trigger the Harmony-M, then in the Mic setting section, the Vocal Harmony control under the KBD column must be set to Upper in order to send the correct MIDI information to the Harmony-M. If I recall correctly, UD always triggers his vocal harmonies with his right hand chording.

Cheers,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)