Appendix B: System Exclusive Implementation
92
Venom User Guide
NAK
This flag is sent if a patch dump was received incorrectly. This will be the case if the checksum does not match
or the number of bytes in the packet does not match the value defined in the length byte. The device responds
by re-sending the last data packet. The device also sends this message upon receiving an incorrect data packet.
After three consecutive attempts to receive a data packet have failed the device sends the Cancel Message.
0xF0 SysEx ID
0x00 0x01 0x05 M-Audio Manufacturer SysEx ID
0x21 Device Class
<id> Device ID
0x7E Command ID (NAK)
0xF7 EOX
Cancel
The device responds to the Cancel Message by aborting a data transfer. It is also possible for the device to send
the Cancel Message. This occurs after 3 unsuccessful attempts to send a data packet.
Additionally, if a data packet is expected, but not received within a 1 second period, the device sends a Cancel
Message.
0xF0 SysEx ID
0x00 0x01 0x05 M-Audio Manufacturer SysEx ID
0x21 Device Class
<id> Device ID
0x7D Command ID (Cancel)
0xF7 EOX
Arpeggiator Data Format
Each event is stored in a 4-byte packet. Since the maximum size of a pattern is 1024 bytes, the maximum num-
ber of events is 256. Each event includes a note on, controller, or pitch bend event, packed into a 4-byte packet
(where note off events are always represented as note on, velocity zero).
TS: 16 bits of Time-stamp relative to pattern start, 96 ticks per quarter note.
F1 & F2: two single bits that are used to define the event type.
Bit 76543210 76543210 76543210 76543210
TTTTTTTT TTTTTTTT FDDDDDDD F DDDDDDD
SSSSSSSS SSSSSSSS 22222222 11111111
F2 F1 Event Type
0 0 Note
0 1 Controller
1 1 Pitch Bend
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