I fear your best bet at this point is to try and contact the OpenJDK
developers upstream. Their “fixing policy” is a bit annoying, so you’d
first have to see if it’s still a bug in the latest JDK, then if it gets
fixed, the fix can be backported to the LTS JDKs (21, 17, 11, 8).
I see you invested
In the traced MIDI messages in the bug-report, the top line is the most
recent, and the bottom line is the oldest. It came from the Java
console (of IcedTea).
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The attached JAR-file has online help (click the Help button) to explain
how to use it. Unfortunately, Java cannot 'see' ALSA MIDI devices, so
you have to use a hardware MIDI interface (such as a USB MIDI keyboard).
The code to compensate for the out-of-tune pitch-bend makes things
worse, but you
