I've been doing some research on the TC-Helicon harmony singer 2 and found that it will only work with pitch set at 440hz for A., not the 432 hz.
However, the good news is that the TC-Helicon Harmony G-XT does work at 432. You will press a three key combination while power the unit and teach it by paly in 432. It works very well even with the harmony.
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