Why does SoundHelix show "javax.sound.midi.MidiUnavailableException: Undefined external error."?

This problem occurs on Windows 10 if you use the MIDI device "Microsoft GS Wavetable Synth". Edit your SoundHelix XML file and make sure that you use the MIDI device "Gervill" instead. Simply move "Gervill" to the beginning of the list of MIDI devices (or if it is not in the list, prepend it to the list), like so:

<device name="device1" clockSynchronization="true">Gervill,Microsoft GS Wavetable Synth,Microsoft GS Wavetable SW Synth,Java Sound Synthesizer</device>

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