Do they work with other browsers or computers? If not, then check the next step.

Do they work without the router? If yes, then the router is the problem.

If none of the files from the sound library are loading, there could be a connection issue caused by an internet router or firewall. A solution to this is to whitelist in the router settings.

If you have problems with MIDI files specifically, please double check that you've dragged MIDI files on to Instrument Channels (not Audio Channels)! Please read more about this in our Learn article here: