In JamGrid, click on 'Setup'. For 'MIDI Output' you will probably see
'MIDI Mapper'. Click on the words 'MIDI Mapper' and you will get a drop-down
box with other options.
Make sure you are seeing all of your options by using the up and down arrow
keys on your computer keyboard. Try selecting each option that appears until
you are able to hear sound.
Also make sure 'Extended Level Synth' is selected.
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