Inaudible pitch change

[agourlay]

I am using Rustysynth 1.3.2 to play guitar sound and I facing some difficulties with set the pitch bend.

The context is similar to my previous issue where you helped me split the values for the synthesizer 🙏

I was too fast to declare victory after being able to hear any pitch changes 😆

The pitch change is not always audible in my application.

I have a specific sequence of events corresponding to a down bend on a single guitar string.

The sequence is the following:

Note on: channel=4, key=69, velocity=127
Midi message: channel=4, command=224, data1=0, data2=80
Midi message: channel=4, command=224, data1=0, data2=80
Midi message: channel=4, command=224, data1=0, data2=79
Midi message: channel=4, command=224, data1=0, data2=78
Midi message: channel=4, command=224, data1=0, data2=77
Midi message: channel=4, command=224, data1=0, data2=76
Midi message: channel=4, command=224, data1=0, data2=75
Midi message: channel=4, command=224, data1=0, data2=74
Midi message: channel=4, command=224, data1=0, data2=73
Midi message: channel=4, command=224, data1=0, data2=72
Midi message: channel=4, command=224, data1=0, data2=71
Midi message: channel=4, command=224, data1=0, data2=70
Midi message: channel=4, command=224, data1=0, data2=69
Midi message: channel=4, command=224, data1=0, data2=68
Midi message: channel=4, command=224, data1=0, data2=67
Midi message: channel=4, command=224, data1=0, data2=66
Midi message: channel=4, command=224, data1=0, data2=65
Midi message: channel=4, command=224, data1=0, data2=64
Midi message: channel=4, command=224, data1=0, data2=64
Midi message: channel=4, command=224, data1=0, data2=64
Midi message: channel=4, command=224, data1=0, data2=64
Note off: channel=4, key=69

I would expect to hear the pitch going down.

Those events are played over a realistic period of time but I can not hear any change of pitch between the two NoteOn/NoteOff instructions.

Is there anything specific to configure to get the change of pitch working?

For reference, this is how I build my synthesizer https://github.com/agourlay/ruxguitar/blob/master/src/audio/midi_player.rs#L82

Thanks again for this awesome project!

[sinshu]

I attempted to reproduce the issue.

The following code uses the TinyAudio crate to play a single guitar note and apply pitch bending. As in your MIDI message sequence, data2 oscillates between 64 and 80.
https://github.com/sinshu/rustysynth-bend-test/blob/main/src/main.rs

This bend range is quite subtle, as it represents half of a semitone, which might make it less noticeable. However, in my environment, it sounds like the pitch bends as expected. Does this minimal code reproduce the issue in your environment?

[agourlay]

Thank you very much for taking the time to build a reproducer!

I do hear the subtle change of pitch in your example, I will investigate further on my side and keep you posted.