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| Reporter | lorenzosu | Assigned To | x42 | |
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| Priority | normal | Severity | minor | Reproducibility | always |
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| Status | resolved | Resolution | fixed | |
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| Platform | GNU | OS | Linux | OS Version | (any) |
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| Product Version | 7.2 | |
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| Summary | 0009230: MIDI Import intrprets midi pitch-bend rest position incorrectly as automation lines |
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| Description | Importing a MIDI files Ardour always tries to 'interpolate' (i.e. create a line) between different pitch bend values, including if the value is 8191.
8191 should be considered the 'rest' or 'central' position of a pitch bend (wheel) and therefore a netural value not to be automated towards the next value unless explicitly requested. Some software expose to the user values of -8191 to +8191 and 0 (zero) as the central position which is more similar to how the actual pitch bend wheel works on many keyboards.
The problem is that typically sequencers interpret this value as a rest position and therefore won't automate to the next value, unless a series of controllers is explicitly required.
Overall this poses the more general issue of how to interpret 'automation' in midi, especially when importing and when control or pitch-bend changes are written in the MIDI file and some have a certain interpretation (e.g. CC 64 pedal, or other on/off controllers don't really make sense to be automated continuously).
Attached is a simple 1-track midi file which shows the problem.
Also attached screenshots of how Ardour imports it and how it is interpreted and used in other two MIDI sequencer software
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| Steps To Reproduce | - Import a MIDI file with pitch bends which include explicit values of 8191 (like the attached)
- Ardour interprets as automation lines changes from the last 8191 to the next different value |
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| Tags | Midi, midi import, pitch bend |
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