Project created on Steam Deck doesn’t output sound

It doesn’t output sound if I create a project on Steam Deck and try playing the recorded audio track from the audio interface or the SinGen synth using virtual keyboard.

The track has audio waves
https://transfer.sh/W1HIAw/korg.zip

Looks like connections are missing or lost. Do you use JACK?
In any case: connect master out to your soundcard’s outputs:

and the track’s output to the master-bus using the output selector at the bottom of the track(s). The following screenshot may help:

Changing the routing fixed the project sound