[ubuntu-studio-users] Huber is right I say.

[Robert Willey]

If u opens hydrogen it can be the switch to jack audio. Until u shut jack u may find alsa wont play. 
U can assign jack to other players . I do. Hydrogen can be set to open jack on launch also. Handy but if u forget that jack runs in background. 
Normal workarounds .
Cheers - Robert 
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