Hey, It seems to be a known issue that you cannot run JACK with the capture period size lower than 512 with the SBLive ALSA driver. See this thread:
http://ccrma-mail.stanford.edu/pipermail/planetccrma/2003-December/003764.html and this: http://www.music.columbia.edu/pipermail/linux-audio-user/2003-April/004040.html The above threads seem to indicate that this is a hardware limitation. However it seems to me more like a driver issue. Using the kX drivers (on Windows, http://www.kxproject.com) with the exact same card, an old SBLive Platinum, Ableton Live is usable with the record and playback period sizes (set via ASIO driver config) at 64 samples (2.33 ms latency) with nothing else running, and rock solid at 128 (~5 ms) in the face of basically anything you throw at it. Of course it crashes, as it's Windows, using an alpha quality third-party driver, but is quite usable in a live music setting. 512x2 is not really usable for my purposes. Is this assessment correct, and if so, can someone familiar with the SBLive ALSA driver give me an idea as to how this could be fixed? Could this be done via ALSA config files maybe? Lee
