You should be able to enter MIDI notes directly using Chromatic mode (page 83 of the current manual). Use Function and Down to select it, then Function and Left / Right to switch octaves (you can go beyond the 2 octave sampler limit with MIDI tracks). Trig LED colours mark the notes (yellow for C, red for white keys, black keys unlit).

Obviously you won’t get velocity etc., but if course you wouldn’t get that with the A4 buttons either. You will get a wider playing range than the A4 offers, though.

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