MusicianCV · TR

Variable-length quantity

Open the interactive module

Timing and files

The high bit indicates another byte follows. Decode 0x81 0x00 as 1 × 128 + 0.

Variable-length quantity · 81 00 → 128

File meta events, event positions and live transport messages serve different functions. Inspect this example in its proper context using an SMF reader or MIDI monitor.

Example

Code or time base / interpretation · 81 00 / 128

Code or time base / interpretation

81 00 128

Try it

What unit is being used for timing?

AnswerCheck the file’s PPQ or SMPTE division. MIDI Clock on the wire uses 24 pulses per quarter independently of SMF tick resolution.

Related topics

Quantize: which timing are we adjusting?

References

MIDI specifications and reference tables

Subject-expert review pending.