according to the user manual,
notes 24h, 26h, 28h, and 29h controls channel a input 1, 2, 3, and 4
notes 2bh, 2dh, 2fh and 30h controls channel b input 1, 2, 3, and 4
i dont have a keyboard/controler right now so I cant test but if they wrote, it suppose to be ok though
bw