Linux-audio-user May 2012

linux-audio-user@lists.linuxaudio.org

113 participants
106 discussions

by Thorsten Wilms

Hi! Seeing how 55 of 154 emails for May so far are from Ralf, I'd like to propose a name change for this list from "linux-audio-user" to "ralf" (I considered "linux-audio-ralf", but thinking back, that's too limited in scope). -- Thorsten Wilms thorwil's design for free software: http://thorwil.wordpress.com/

13 years

Hydrogen Drumkit Contest : only 1 month to go !

by thijs van severen

Hello drumkit-making people :-) This is a friendly reminder that the Hydrogen Drumkit Contest<http://hydrogen.popez.org/hcms/node/2035> deadline is rapidly approaching (little more than a month to go) So if you have created a great drumkit don't wait to long to submit it ! Fan-tas-tic-ly fa-bu-lous prizes are waiting for you ;-) Happy drumming Grtz Thijs ps: sorry for cross posting

13 years

Re: [LAU] OT: Behringer PSU UB-SPSU2 for an Eurorack UB2442FX-PRO

by Ralf Mardorf

Hi Gene :) On Tue, 2012-05-08 at 11:13 -0400, gene heskett wrote: > On Tuesday, May 08, 2012 10:32:50 AM Ralf Mardorf did opine: > > When I turned on my 7 year old Behringer > > > Using its age as a clue, I think I would be gong through it with a > "Capacitor Wizard" checking the caps in the psu in particular. I guess I already found the problem. On the primary side there are a 1u 50V and a 47u 25V capacitor, both 85°C. Thomas said I should replace them with > 100°C, even if they look ok. I've got capacitors on stock, but bad equipment for soldering. Unsolder already was hard, but I can't get it soldered, especially since the 47u I've got, has got a larger diameter, since it's a 35V. Reading glasses btw. are less good for soldering, I need to find a better tool to see when soldering. Thomas has got some special glasses. > I haven't a clue what it may be called on your side of the pond though, so > I will describe what it does in hopes it might be recognizable as a euro > made and named testing device. > > It is a small, low power oscillator, generating about 85 millivolts of rf > signal, at a nominal frequency of 100 kilohertz, the currant it can send > through a capacitor is presented on a meter, usually calibrated with a knob > so that it reads full scale when the probes are shorted together. Thomas has got Hameg oscilloscopes with component testers. Btw. the capacitors I unsoldered are broken now, even if they should have been ok before. Not because of heat, but to take hold of the capacitors damaged them. > Having a spare for that sort of thing is a good idea. Asking if it will > fail is like asking if freshly poured concrete will crack. The "if" is > wrong, the correct word is "when", because it will, always. :) I'm not a fan of switching power supplies. > Good luck Ralf. > > Cheers, Gene Thank you Gene, Thomas tries to visit me in some hours. Ralf

13 years, 1 month

EPROMs, Firmware, Updates sharing for synth

by Ralf Mardorf

Hi :) anybody interested in EPROMs, Firmware, Updates sharing for synth? Regards, Ralf

13 years, 1 month

ANN: din 3.5, a Free software musical instrument for GNU/Linux.

by S Jagannathan

Hi, Pleased to announce release 3.5 of din, a Free software musical instrument exclusively for GNU/Linux. The key additions to this release are drones that trace lissajous figures and leave trails, mouse driven pitch bend on the keyboard-keyboard and more: http://dinisnoise.org/release_notes/ Download: http://dinisnoise.org/download/ Tutorial & Demo videos: http://dinisnoise.org/videos/ Just submitted Ubuntu packages for building at Launchpad: https://launchpad.net/~dinisnoise/+archive/din/+packages If you have any problems installing din from packages or from source please let me know. If you can help package din for various distributions would love to hear from you. Regards jag

13 years, 1 month

rtirq, kernels >= 3.2 and udev

by Fernando Lopez-Lezcano

Hi all (and Rui), As noted in another thread I found out that the naming of the irq processes of pci soundcards has changed with kernels >= 3.2 to be uniform and predictable. That made it possible to change rtirq so that (at least for pci cards) only the irq process that corresponds to the soundcard gets an elevated priority - this was not completely reliable before. Another nice (very nice I'd say) side effect of this change is that now udev can be trivially used to change the priorities of soundcards dynamically. I tested this while running 3.2.16-rt27 on a Fedora 14 system. I removed "snd" and "usb" of the rtirq sysconfig file so that it would not touch those and rebooted. My hda_intel got the priority I wanted, inserting (or removing) a usb or a pci-express card with a Multiface II worked as well. Right now my simple script does not try to order priorities, it just sets them to a fixed one. But well, it is a start... Code attached (the udev rule goes into /etc/udev/rules.d/ in my system)... This simple script also returns the priority of the usb irq for the soundcard to 50 (the default) when the card is unplugged, but it does not check for multiple cards (ie: even if another soundcard is still using the same irq process it downgrades its priority), this should be fixed. Feedback appreciated. -- Fernando PS: Another rtirq script in /etc/pm/sleep.d/ could save the current priorities before a suspend and restore them after a resume - that does not happen currently.

13 years, 1 month

OT: Behringer PSU UB-SPSU2 for an Eurorack UB2442FX-PRO

by Ralf Mardorf

Hi and sorry for the OT, perhaps somebody is able to help me. When I turned on my 7 year old Behringer mixer there was no power for the mixer and effect. When I also turned on the phantom power, there still was no power for the mixer and effect, but the phantom power LED started "pumping" (it's on, but slowly becomes lighten and less lighten). The original fine fuse is ok. I unmounted the PSU. Everything looks ok, excepted of one resistor. When it was unsoldered I measured it. The resistor seems to be ok. It at least is ok, when not under load. There's a brown stain at the resistor where one of the resistor's wires emerges. It looks like soldering flux and it's possible to scrape it off, so it simply might be soldering flux. I first should have measured the PSU outputs, since it's possible, that it's not the PSU. Anyway, I still suspect it's the PSU, model UB-SPSU2. Since I don't own an isolating transformer and it's very unhandy if the mixer is opened and everything is mounted, I won't do troubleshooting during operating at the moment. I do a google.de search for UB-SPSU2 now. I'm sure a friend is able to help me, but he isn't easy to reach and I will test my tuned Ubuntu Studio right now. Any hints are welcome! Regards, Ralf

13 years, 1 month

Re: [LAU] rtirq - what does it improve, and how can I measure it?

by Ralf Mardorf

Since some days often mails don't came through LAU mailing list only. There are no issues with other lists. Of cause cross posting might be a valid reason, but it also happens randomly. -------- Forwarded Message -------- From: Ralf Mardorf <ralf.mardorf(a)alice-dsl.net> To: Robin Gareus <robin(a)gareus.org> Cc: A list for linux audio users <linux-audio-user(a)lists.linuxaudio.org> Subject: Re: [LAU] rtirq - what does it improve, and how can I measure it? Date: Tue, 08 May 2012 16:08:57 +0200 On Tue, 2012-05-08 at 16:03 +0200, Robin Gareus wrote: > > So patch-3.0.23-rt40 already includes it? I don't need to patch the > > patch? > > I don't know, but I expect so. UTSL. Good idea ;)! > patch-3.0.30-rt50 does include it. Thanks, Ralf

13 years, 1 month

rtirq - what does it improve, and how can I measure it?

by Kaj Ailomaa

I understand that the rtirq script is designed to raise rtprio for audio devices, which is made possible on the vanilla kernel since 2.6.39(?), if passing the threadirqs option to the kernel at boot, and having built it with the CONFIG_FORCE_THREADIRQ. From my experience, I have not had any performance boost using the rtirq script, but I have read about it helping those who are getting xruns due to irq sharing. So, I'm wondering. What picture do others have of the benefit of the rtirq script? ..and are there other ways to measure improvement for audio operation other than spotting xruns at different latency settings, and reading the rtprio for various devices using the 'ps' command?

13 years, 1 month

alias noise with gstreamer

by Atte André Jensen

Hi I've been using Transcribe! for ages, but are having problems with the latest version on my arch linux laptop (it *used* to work, not sure if something got updated, or this install is different). Older versions work fine. The trouble is that transcribe adds heavy amounts alias noise to the signal. I mailed the developer, and he said he think it might have something to do with the fact that recent versions is using gstreamer for audio. I don't know *exactly* what gstreamer is... 1) What other application can I use to playback (in 44100, that's the forced ar in transcribe) and output to gstreamer for testing purposes? 2) Any idea how I can make the resampling (I imagine that what's going on) sound better? Thanks in advance for any input! -- Atte http://atte.dk http://modlys.dk

13 years, 1 month

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Linux-audio-user May 2012