Using Ubuntu 10.1. I cannot hear any sound from recorded content in Ardour. Signal meter show sound , but nothing is coming out of the speakers.Jack is set with output to my sound card.
Personally, I find that JACK can sometimes identify which speakers are which incorrectly. This happens to me on my mediacenter PC when I start JACK with the default number of outputs. In this case, JACK starts with six outputs (it's a 5.1 soundcard), but when I start Ardour, and the master bus connects to outputs 1 and 2, I can't hear anything. I have to either manually connect the master bus to ouputs 4 and 5 to get sound through the correct output pair, or (what I always do now, as I only have a stereo pair of speakers connected) start jack with only two outputs. When I do that, the two outputs that are started are the correct ones. Not sure why it works this way, but this may be part of your problem.
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