Program dumps | System overview | Bytes | Byte map
Community reverse-engineered specification for SYSTEM dumps captured while holding SYSTEM on the M7. These are I/O and routing settings — not program sound parameters. Not an official Bricasti specification.
Auto-generated by
python run.py(orpython -m m7_sysex export). Re-run after adding dumps undersysex/system/; do not hand-edit generated pages.
Observed length: 77 bytes for the captured system dumps.
| Offset | Size | Content |
|---|---|---|
| 0 | 1 | F0 SysEx start |
| 1-3 | 3 | Manufacturer ID 00 62 63 (Bricasti Design) |
| 4-7 | 4 | Header 70 08 02 00 (SYSTEM family; byte 6 is 02 vs 01 on PROG) |
| 8-71 | 64 | System payload as nibbles (0x00-0x0F) — no program-name / register-basis region |
| 72-75 | 4 | Checksum: CRC-16/ARC over offsets 8-71, packed as four high-nibble-first bytes |
| 76 | 1 | F7 SysEx end |
F0 | 00 62 63 | 70 08 02 00 | <system payload nibbles> | <4 nibble cs> | F7
- Same nibble packing and checksum algorithm as program dumps, but a shorter message with a different header and no program-name field.
- Each
sysex/system/<series>/folder is an independent capture stream (same convention as program parameter folders). - Program-dump analysis, byte map, and Kaitai spec do not include these offsets.
| Series | Offsets | Encoding | Confidence | Dumps |
|---|---|---|---|---|
| Audio Format | 15 | raw_u8 |
high | 2 |
| Audio Routing | 13 | raw_u8 |
high | 3 |
| Display Level | 21 | raw_u8 |
high | 5 |
| Dry Gain | 10-11 | nibble_hilo |
high | 9 |
| Midi Bank | 25 | raw_u8 |
high | 14 |
| Midi Channel | 22-23 | nibble_hilo |
high | 17 |
| Output Level | 17 | raw_u8 |
high | 3 |
| Wet Gain | 8-9 | nibble_hilo |
high | 8 |
System layout is 77 bytes. Full table: byte-map.md · short overview: byte-map-overview.md. Codegen: m7_system_dump.ksy / m7_system_dump.spec.json.
| Status | Bytes |
|---|---|
| Known / frame / checksum | 77 |
| Secondary | 0 |
| Unknown | 0 |
Index with descriptions: bytes/README.md.
- Audio Format (high)
- Audio Routing (high)
- Display Level (high)
- Dry Gain (high)
- Midi Bank (high)
- Midi Channel (high)
- Output Level (high)
- Wet Gain (high)
- Audio routing: offset 13 (
raw_u8); Stereo=0, Mono L=1, Mono R=2. - Display level: primary field @ offset 21; offset 25 also moves in this series (secondary).
- MIDI channel: encoded 0-15 maps to channels 1-16;
omniuses encoded 16. - Output level: primary byte at offset 17 (
raw_u8values 0, 1, 2 for UI 8/16/24). - Wet gain: offsets 8–9 (
nibble_hilo); Off/Full are discrete; numbered settings are 0.5 dB steps from −60 dB to 0 dB (Full). - Dry gain: offsets 10–11 (
nibble_hilo); Off/Full are discrete; numbered settings are 0.5 dB steps from −60 dB to 0 dB (Full).
Last exported: 2026-07-22
- Offset 25 coupling —
midi bankprimary @ 25; display-level series also moves offset 25 (secondary) - Rarely used SYSTEM knobs (e.g. register lock) not yet in dedicated series