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I have some .TD9 files which are recordings from the Roland TD-9 Drum Computer. (...) Are they anything like MIDI ?
They likely use similar concepts as MIDI files. In the
TD-9 manual, page 41 describes the "quick recording" maximum size as a number of notes (instead of a number of minutes), suggesting it records note data (not audio data). And in
a message board post, a Roland product manager says the quick record performances "contain MIDI data":
Can recorded performances be saved as audio wave data to the memory stick for external processing?
"Quick Record" performances (drum parts played and recorded from pads) actually contain MIDI data, however they are saved to a USB flash drive in a proprietary TD-9 format.
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How many bytes is a timestamp for MIDI ?
In a MIDI file, delta times can be between 1 and 4 bytes. Information about the MIDI file format is available in the Specs section of this site. Get
The Complete MIDI 1.0 Detailed Specification (PDF, log in required) and go to the section "Standard MIDI Files".
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Any help to figure out the grammar of a TD9's .seq file would be greatly appreciated
If you post an example SEQDxxx.TD9 file, I'd like to take a look.