How to record audio of entire playback (all tracks)?

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Newsgroups gmane.comp.audio.rosegarden.user
Message-ID <[email protected]> 
I have qjackctl, qsynth and RG loaded. Some tracks are GM and
most are ZASF-dssi. Everything works but I cannot record with
jack_capture because it don't work. As an alternative the RG 
recording feature comes to mind BUT it records only ONE (the 
selected) track. How can I select ALL track to be recorded 
just as if I were sueing jack_capture?
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