john gibby wrote: > > Hi, > > I'm having trouble setting up Jack to interface between my digital piano > > application (pianoteq) and the ecasound audio processing app. I'm using > > ecasound with Ladspa plugins to create a crossover network. Ecasound > > splits the 2 pianoteq channels into six (woofer, mid & tweeter), and sends > > them to my analog outputs through alsa. I have it working, with jack & > > qjackctl, but the buffer size that jack is presenting to the digital piano > > app is 1024, about 10x bigger than I want. I would like pianoteq and > > ecasound to run synchronously with minimal latency. At first I thought I > > could just call jackd -d ecasound -p 128, but of course ecasound is not > > one of jack's supported backends. So I've been using the "dummy" backend, > > and using qjackctl to connect ports from pianoteq to ecasound. That works > > fine, but I can't manage to configure the buffer size down to 128, even > > though I start up ecasound with -i jack -b:128 FWIW, from 'man ecasound': Note that when any JACK input/outputs are used, the buffer size setting is overridden and set to period/buffer size reported by JACK server (e.g. jackd’s ’-p’ option). It is not possible to turn off this behaviour. > > , and I also go to setup in > > qjackctl and specify buffer size 128 for "dummy". When qjackctl brings up > > the jack server, the buffer size gets overridden to 1024; I see the message > > in the log. What am I doing wrong? Is Jack the wrong approach, when it is > > ecasound, not jack, that writes to alsa? Ecasound can connect to both ALSA and JACK devices. I've used that option in a setup using two soundcards. It is more common that jackd manages the soundcard. Do you have any reason not to do so? HTH, Joel > > Thanks very much! > > John > > Msi mb with i5 3ghz, AVS Linux > > > > > > > > -- > Sent from Gmail Mobile > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user -- Joel Roth _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
