SYSEX_DATA_OFS
sysex[SYSEX_DATA_OFS] = code;
sysex[SYSEX_DATA_OFS + 1] = (value >> 12) & 0x0f;
sysex[SYSEX_DATA_OFS + 2] = (value >> 8) & 0x0f;
sysex[SYSEX_DATA_OFS + 3] = (value >> 4) & 0x0f;
sysex[SYSEX_DATA_OFS + 4] = (value) & 0x0f;