Re: [LAD] latency issues (practical aid needed on a practical example) (fwd)

Hi everyone! (this was first posted on Linux-Audio-Users, but is probably really more suited to this list.) I just compiled a sound generator, which can be controlled vai MIDI, it uses simpe raw-midi and jack as output, via bio2jack. Now I have horrible latency 0.2-0.5sec (rough estimate). Where should I start looking in my setupt. I know others had the software running without problems. Sorry for being so abstract, but I'm not allowed to mention the software. :-( I already tried setting internal audio-buffer to 128 samples and reducing message queues for the tonegenerator and MIDI. Still it's much too much latency. Does bio2jack have some settings for reducing latency? Does bio2jack do samplerate conversion, is it costly? The sound-engines samplerate is set to 44100 or 22050 and my JACKd runs at 48000. But I could post parts of the source if necessary. My setup is: Debian Lenny with custom built kernel 2.6.24-rt1 JACK subversion 0.109.0 jack-commandline: jackd --timeout 4500 -R -d alsa -d hw:1 -r 48000 -p 128 -H -M -z shaped ALSA version 1.0.15 Any idea where to optimise? Kindest regards Julien