Transmission Data Bulk data of 1 voice (add 155th byte and make the 2's complement) Bulk data of 32 voices (transmited when it is unavailable) (add 4096th byte and make the 2's complement) Parameter change common Voice MIDI active sensing This message usually requests transmission every 80msec (except for the period of transmitting/receiving the bulk dump). Reception Data This message can be received when the channel number of reception data accords with the channel number of the DX7. MIDI active clock This message usually requests reception regardless of MIDI channel number. When this clock is suspended longer than 666 msec (except for receiving the bulk data), the on-going sound turned OFF. Bulk data of 1 voice This message requests reception with the same format as transmission when MIDI channel numbers are corresponded, system information is available, and Memory protect is off. (v : ignored) Bulk data of 32 voices This message requests reception with the same format as transmission when MIDI channel numbers are corresponded, system information is available, and Memory protect is off. Parameter change Voice parameter and function parameter request reception with the same format as transmission when MIDI channel numbers are corresponded, system information is available, and Memory protect is off. This message requests the performance data of the DX1 A-side. (LS 4 bit are ignored.) ignored ignored (add 94th byte and make the complement on 2) (ignored) ...