(3) TRANSMIT/RECEIVE DATA. (3-1) CHANNEL VOICE MESSAGES. (3-1-1) NOTE OFF. STATUS. 1000nnnn(9nH) n=0-15 CHANNEL NUMBER. NOTE No. 0kkkkkkk k=0(C-2)-127(G8).
https://nl.yamaha.com/files/download/other_assets/3/1243343/CP88_CP73_supplementary_manual_Nl_v200_H0.pdf