Sustain pedal does not work for mono sounds in JX10
The JX10 synth plugin may be configured in monophonic or polyphonic modes. The sustain pedal (MIDI CC 64) works as expected for polyphonic modes but does not work for monophonic modes.
I have a patch (that may depend on the fix for issue #4) that resolves this, allowing monophonic sustain. The issue may be present in other synth engines that I have not yet looked at. A similar patch may be possible for them. I will submit a PR when I have completed testing the fix.