I was very pleased to find out tonight that you can indeed set the harmony settings to OTS:

Just set the harmony type and save each OTS in BOOK 1 / 2 and save new song. Works like a charm - fantastic feature.

zuki
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)