Hi Lee,
How about switching OTS manually for those song where you need to hold RH.
That means turning off the OTS link.
It takes only a second and might be an acceptable work around.
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer