Latest version in sid and Karmic does not have JACK support compiled in:
https://buildd.debian.org/fetch.cgi?&pkg=bristol&ver=0.40.1-0.1&arch=amd64&stamp=1242392903&file=log
** Changed in: bristol (Ubuntu)
Status: New => Confirmed
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no JACK support
https://bugs.launchpad.net/bugs/383999
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