Linux-audio-user November 2008

linux-audio-user@lists.linuxaudio.org

174 participants
151 discussions

No capture input with Behringer UAC202 Audio Interface

by Carma Trepp

Hi all I have some problems with the Behringer UAC202 Audio Interface. In alsamixer I see only the output, but no capture input. Same in gnome mixer. I also hear no sound from the input. Only the output works. I read users are successful with this audio interface. Below I add the output from aplay -l / aplay -L I hope I get it to work to record my synths. Regards Carma aplay -l ---------- **** List of PLAYBACK Hardware Devices **** card 0: V8235 [VIA 8235], device 0: VIA 8235 [VIA 8235] Subdevices: 4/4 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 card 0: V8235 [VIA 8235], device 1: VIA 8235 [VIA 8235] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: default [USB Audio CODEC ], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 aplay -L ---------- front:CARD=V8235,DEV=0 VIA 8235, VIA 8235 Front speakers surround40:CARD=V8235,DEV=0 VIA 8235, VIA 8235 4.0 Surround output to Front and Rear speakers surround41:CARD=V8235,DEV=0 VIA 8235, VIA 8235 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=V8235,DEV=0 VIA 8235, VIA 8235 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=V8235,DEV=0 VIA 8235, VIA 8235 5.1 Surround output to Front, Center, Rear and Subwoofer speakers iec958:CARD=V8235,DEV=0 VIA 8235, VIA 8235 IEC958 (S/PDIF) Digital Audio Output null Discard all samples (playback) or generate zero samples (capture) front:CARD=default,DEV=0 USB Audio CODEC , USB Audio Front speakers surround40:CARD=default,DEV=0 USB Audio CODEC , USB Audio 4.0 Surround output to Front and Rear speakers surround41:CARD=default,DEV=0 USB Audio CODEC , USB Audio 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=default,DEV=0 USB Audio CODEC , USB Audio 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=default,DEV=0 USB Audio CODEC , USB Audio 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=default,DEV=0 USB Audio CODEC , USB Audio 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers iec958:CARD=default,DEV=0 USB Audio CODEC , USB Audio IEC958 (S/PDIF) Digital Audio Output

16 years, 10 months

Re: [LAU] new laptop redux

by shane richards

Dave, Tips for getting Ubuntu audio going would include: Preparation: Huge supply of favourite beverage and a few days put aside. It's quite a task, but worth the effort. 1) Add the Medibuntu repositories to get all your codecs 2) Add the ubuntu-studio repos, but don't just install the entire set; pick and choose the bits and pieces that you want - or you'll be wasting more time and cursing and swearing and fixing things later. 2b) DON'T USE these from ubuntu-studio repos: ardour, rosegarden, bristol, hydrogen or jamin as the versions supplied are outdated. Build them yourself (except ardour and jamin) from cvs/svn. Easy way: use 'apt-get build-dep <package-name>' to install build dependencies, then compile your source from there. 2b) Get jack SVN. Maybe the easiest way is to leave the ubuntu version of jack intact and build and install over the top of it. That way your dependencies won't break. Make sure you install to '/usr' NOT '/usr/local' or things can go haywire with two versions of jack laying around. 3) Nice versions of ardour (built with LV2 support), jamin and LV2 itself can be found by adding the EMA Tech. repos. Cut-n-paste the following into '/etc/apt/sources.list' ## EMA Tech. APT repository (bleeding-edge ubuntu-studio compatible) # Binaries deb http://archive.ematech.fr intrepid all deb-src http://archive.ematech.fr intrepid all 4) Get a copy of rncbc's rt_irq script. It's a good basis to get all your audio timing right. (Oh, once it's installed, run jack at priority 70) 5) You can remove "pulse" and "arts" packages, but the libraries will remain. (For the life of me I can't understand why removing libraries for a sound daemon means you have to uninstall half your system, but that's how it is, I'm afraid (Although maybe with fluxbox it won't bother you - I'm on KDE4) I also removed lashd as it seems to make audio apps use much more processing power - I can't fathom why. But your cpu will max-out much faster with lashd running in th bg. As I read on a list somewhere: "replace lash with bash!". 6) My personal kernel of choice would be the 2.6.24-rt. The later kernels haven't been very successful for *me*, with regards to audio. DO NOT EVEN TRY the 2.6.26 series - I lost months of composition time with that beast. 7) If you're running NVIDIA drivers, browse through the NVIDIA forums as there's still plenty of fiddly xorg.conf stuff to do, especially if you want openGL AND audio stability. There's more, but that's a good start. >I have one more permissions problem to resolve (access to /dev/nvidiactl >is forbidden to the normal user) then I believe I'll have my target >machine, i.e. a portable box that can run AVSynthesis (OpenGL + Csound). >Btw, I've already scrapped the GNOME desktop in favor of fluxbox (of >course), but I'd certainly like to hear from other Ubuntu users >regarding any other recommended streamlining. For instance, I'd like to >junk pulseaudio and compiz completely but I'm not sure how to do it. >One question: Should I go ahead and install the UbuntuStudio packages ? >I have the rt-kernel, it seems I could just go ahead and install the >rest. Any reasons not to do so ?

16 years, 10 months

USB, realtime, practical considerations

by Matthew Smith

Hi Folks Whilst my 2.6.24.7-rt17 kernel and disabling all hardware and services unneeded for audio seems to have gotten rid of those nasty xruns, I live in fear that they will return. My main worry is how I organise my USB devices. My laptop (ThinkPad Z61m) has 3 USB ports. I have several devices that need to be connected to them, meaning that I need to use USB hubs. Here are some assumptions (or guesses) that I have made, on which I would appreciate comment: * It would be best to balance the devices across the 3 ports. * My soundcard is a Behringer UCA202, capable of sampling at a maximum of 48kHz @ 16bits x 2 channels. I'm guessing that this will have the greatest data rate of all attached devices. - Should it have its own port? - Can USB 2.0 take more than this (like another device?) - Anyone know how to set the sampling rate on this device through Linux? Just specify in Jack setup? * Now that I know that I can run USB to MIDI devices through a powered hub (thanks David), I was thinking of of hooking the following into a 7-port hub: - iPod cable (no iPod on the end, so no burden.) - cellphone cable (as per iPod cable.) - external USB QWERTY keyboard (don't have desk space for this when doing audio work, so hope it won't be transmitting any data.) - trackball (only transmitting when wiggled (I hope) - which should not occur when recording is going on.) - USB floppy drive (not in use when recording.) - USB to MIDI interface - Another USB to MIDI interface - is it too much to have 2 of these on the same hub? If not, would it take a third? Cheers M -- Matthew Smith Smiffytech - Technology Consulting & Web Application Development Business: http://www.smiffytech.com/ Personal: http://www.smiffysplace.com/ LinkedIn: http://www.linkedin.com/in/smiffy

16 years, 10 months

wav to avi

by Neville Cross

Hi, I need to convert a wav audio file into an avi file so I can create some eye-candy to watch while I listen. Is there a linux app which can convert it? Nev.

16 years, 10 months

[Slightly OT] 312.5Hz

by Matthew Smith

Hi Folks Slightly off-topic, but does anyone here know any audio significance of 312.5Hz? I have here a module from a piece of equipment dated back to 1968. It consists of a 4-pole, 50Hz motor, a printed disc, a lamp and a photocell. The printing on the disc (rotor) is a wiggly line of changing frequency which - according to the disc - represents a signal between 312.5Hz and 3kHz when spinning at 1500rpm. You light the lamp, spin the motor, then amplify the signal from the photocell. I've decided to use this as a tone source, replacing the filament lamp and photocell with an LED and LDR, or possibly a phototransistor. What I was wondering was whether end frequencies coincided with any musical notes. Cheers M -- Matthew Smith Smiffytech - Technology Consulting & Web Application Development Business: http://www.smiffytech.com/ Personal: http://www.smiffysplace.com/ LinkedIn: http://www.linkedin.com/in/smiffy

16 years, 10 months

no connection...

by Preston C.

It has been a while since I have tried to use qjackctl, but I still run into the same problem. I open and then start qjackctl, then I open qsampler and load a .gig file. In connection in qjackctl I connect "32:Audigy MPU-401 #2" in readable clients to "LinuxSampler" in writable clients. Then I press some keys on my midi keyboard and QSampler does not pick it up. If I connect "Vkeybd" to "LinuxSampler" and press the keys Vkeybd using my mouse, QSampler works??? Many Thanks.

16 years, 10 months

Re: [LAU] new laptop redux

by shane richards

According to: '/etc/udev/rules.d/40-permissions.rules' permissions for '/dev/nvidia*' should be 'root.video' meaning that you just add yourself to the 'video' group, and voila! BUT... on my box they are 'root.root' as well! I haven't found this to be a problem, however. If you really need these permissions, put a script in '/etc/init.d', there's a template init script already in that directory called 'skeleton', you would only need to fill in the "start" section. You may want to keep these two URLS handy - essential reading: NVIDIA Performance problems and workarounds: http://www.nvnews.net/vbulletin/showthread.php?t=118088 NVIDIA Stability problems and workarounds: http://www.nvnews.net/vbulletin/showthread.php?t=58498 - shane Dave Phillips wrote: > > Another question: I changed the ownership for /dev/nvidia0 and /dev/nvidiactl > to include myself, but on reboot the ownerships had reverted. How do I make > the change permanent ? >

16 years, 10 months

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Linux-audio-user November 2008