Message to self: it seems that one has to wait for updated RPi USB firmware/drivers to get USB 2.0 audio going. Obviously the "isochronous transfer mode" as used by audio interfaces is currently broken. gr~~~
2013/1/26 Thomas Grill <g...@grrrr.org> > Hi all, > for my USB audio class 2.0 device "Native Instruments Komplete Audio 6" i > can't report such good news. > There is constant irregular crackling, not only with Pd but also with > aplay etc. It seems related to USB bandwidth, since turning on and off the > inputs in Pd changes crackling frequency. The dwc_otg.speed setting is not > usable for me, since the device is dependent on USB 2.0 operation. > Any experiences with USB 2.0 audio devices under ALSA/rpi? > thanks, > gr~~~ > > > 2013/1/26 Cyrille Henry <c...@chnry.net> > >> hello, >> >> I just install raspbian release and update it. then install pd 0.44.1 >> (without any specific optimisation flag) >> >> I made the standard optimisation : >> * - rtprio 99 >> * - memlock 1000000000 >> in /etc/security/limits.conf >> >> and >> dwc_otg.speed=1 >> in /boot/cmdline.txt >> as suggested by miller >> >> I use a uca222 beringher (that cost about 20 or 25€) sound card. >> trying the test audio and midi, there is no click with 10ms audio buffer >> (with adc~ enable). >> >> this is with usb keyboard / mouse combo plugged and graphical interface >> (for the system and for pd). >> >> without X, audiobuf can be as low as 5ms >> >> having a usb keyboard did not change anything for me. >> >> i'm very happy >> >> cheers >> c >> >> ______________________________**_________________ >> Pd-list@iem.at mailing list >> UNSUBSCRIBE and account-management -> http://lists.puredata.info/** >> listinfo/pd-list <http://lists.puredata.info/listinfo/pd-list> >> > > > > -- > Thomas Grill > http://grrrr.org > -- Thomas Grill http://grrrr.org
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