hi did anyone tried that ? i can make it work with 0..15 but not 127 for currently selected track o CC#99 (0x63 - NRPN MSB) Selects the Track which should be modified via NRPN Allowed values: 0..15 for Track 1-16, 127 to modify the current selected track
seq_midi_in.c says
case 0x63: // NRPN MSB (selects track, if >= SEQ_CORE_NUM_TRACKS, take the currently visible track)
nrpn_msb = value;
break ;