TVA level of Drum Inst. Reverb send level of Drum Inst. Different values of CC98 are used to choose the note number. The rhythm set list on pages 90-93 of your Owner's Manual has a complete list of all note numbers. 24 Selects NRPN Rhythm instrument pitch function.
Higher values produce higher pitches.
Selects NRPN Rhythm instrument reverb level function. Higher values produce more reverb. There is a more complete conversion table on page 113 of your MC-303 Owner's Manual. The body consists of a four byte address, a data byte, and a special calculation called the checksum. F7H End of exclusive The Parameter Address Map starting on page 107 in your MC-303 manual is used to find the addresses for this instrument.