[LAD] Half speed audio playback issue

Hi all, Just wondering if any of you can give me a few clues as to what the possible culprits might be in the case of half speed (one octave down) audio playback. I have recorded live audio into Audacity (stereo @48Khz) and exported it out to a sound file (Ogg, MP3). It plays fine in Amarok, but at half speed in both Ardour and Qtractor. Audacity is going straight to ALSA, Amarok through Xine to ALSA. Looks like some kind of problem with Jack, which is very possible, but I had no problem with using fluidsynth through Rosegarden (I could not load an audio file into it to test though?). I tried to play straight into guitarix, rakarrak, etc. previously and ended up with really bad distorted sound, that also sort of sounded like sampling/processing was not up to speed. I tried with an rt kernel, but no difference (flaky audio hardware is possible). Anyway, if you have experienced this before just let me know what you think it is. Need to dig in further myself, but a few clues from more experiences Linux "audionaughts" will probably help narrow it down faster. Any input appreciated. Thanks. Raymond Martin