furnace/papers/export-tech.md
2022-07-27 17:57:45 -05:00

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# ROM export technical details
## instrument data
TODO
## macro data
read length, loop and then release (1 byte).
if it is a 2-byte macro, read a dummy byte.
then read data.
## pattern data
read sequentially.
first byte determines what to read next:
```
NVI..EEE
N: note
V: volume
I: instrument
EEE: effect count (0-7)
```
if you read 0, end of pattern.
otherwise read in following order:
1. note
2. volume
3. instrument
4. effect and effect value
then read number of rows until next value, minus 1.