Hi,
Welcome to the group!?
To change the instrument via MIDI, You need to look at the LIST BOOK ?for the QY 70/QY 100.
In order to change the bank/program number via Midi you need send TWO/THREE separate midi calls (page 59)… (upto two for bank: LSB,MSB and one for program number) and unfortunately many controllers can only send one message per physical control. ?This is done via two/three Sysex message using the standard Sysex format.
Link to QY70 Listbook:
(Look on page 59 for bank/program change info).
I hope this helps,
Eric
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“The longest journey starts with the first step." ?- Lao Tzu