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The MIDI Forum

  Saturday, 22 April 2023
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From my understanding many midi voices react upon the velocity parameter in the "note on" command. With a low velocity value (vv) a piano, e.g., sounds mellow or smooth while giving it a vv of, say 127, it may sound harsh or strong, just as a piano sounds when you hit the keys hard.

How can I tell whether a midi voice reacts upon vv (other than actually listening to it)? I'm considering giving my organ bass pedal unit constructed from a SAM2695 and a little STM32F103C8T6 (blue pill) microcontroller an extra potby which I can influence the sound of, e.g. the voice "acoustic bass" a different flavor soundwise.
Christoph set the type of the post as  Technical Question — 1 month ago
1 month ago
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#18397
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Other than listening, I believe your only other option is checking the documentation to see if it is mentioned/supported. Not all devices support velocity variations.

The manual for the SAM2695 has a midi implementation chart which shows that it at least accepts all velocity values, but I don't see any mention of it actually responding to them.

If you want to get technical, you could record the sound directly in to a computer without actually listening to it and view the waveform to see if there is any variation with the change in velocity. Perhaps forum user Sema can provide a test file with alternating velocities that you could play back to test it out? Assuming that you have a way of sending a mid file to the device.
3 weeks ago
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#18497
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Thanks for mentioning me!
I've added a test named test-note-on-velocity.mid at https://github.com/jazz-soft/test-midi-files
Most likely, organ will ignore velocity.
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