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--- info:linux_sound [2013/08/17 13:46] – [JACK] formatting moritz
+++ info:linux_sound [2013/08/17 13:49] (current) – [JACK] qjackctl moritz
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   * Scarlett 2i4 only shows up as an input device: Initially, the device would only appear as having two input channels but no output channels. Although I did not figure out the cause of this problem it went away after attaching it several times. Also starting Audacity helped, but that might be coincidence.
+  * I can record fine using JACK using the following settings: 48kHz, 512 buffer size, 2 buffers. Any smaller buffer value crashes JACK at starting, higher sampling rates cause xruns.
 ===== JACK =====
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   - Install JACK support for PulseAudio. In Debian there is a package called ''pulseaudio-module-jack'' that allows to send PulseAudio streams via the interface claimed by JACK. PulseAudio is configured to load these modules when available, so no further configuration is necessary.
+  - Use ''qjackctl'' to configure the server. Set the interface to your desired interface. It will be claimed and not available to any other sound server anymore.
   - To start JACK while PulseAudio is running, use the ''pasuspender'' tool. It halts PulseAudio for the duration of the command running and resumes afterwards. JACK provides a startup command ''jack_control start'' to start the server. Combining the two yields: