Hopefully everything works OK, but here are some tips for the times when not.
Sound is of course essential for any music app. Unfortunately there are always lots of reasons why there may be no sound that are not immediately obvious. Here is a brief checklist of things to try:
• Make sure that Local Audio in Preferences/Audio is set to on
• Check the system volume of your computer
• When running MIDI through a DAW make sure its audio output is on
MIDI is an old protocol and stuck notes can theoretically occur. If this happens please select the Exercise/MIDI Off menu.