Linux-audio-user December 2009

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How does PulseAudio start?

by Jonathan E. Brickman

15 years, 4 months

[ANN] Virtual MIDI Piano Keyboard 0.3.1 released

by Pedro Lopez-Cabanillas

Virtual MIDI Piano Keyboard is a MIDI events generator and receiver. It doesn't produce any sound by itself, but can be used to drive a MIDI synthesizer (either hardware or software, internal or external). You can use the computer's keyboard to play MIDI notes, and also the mouse. You can use the Virtual MIDI Piano Keyboard to display the played MIDI notes from another instrument or MIDI file player. Changelog 2009-12-15 0.3.1 * Russian translation. Thanks to Serguey G Basalaev * French translation, and updated German translation. Thanks to Frank Kober * Czech translation. Thanks to Pavel Fric * Persistent state per channel for banks, instruments, and controllers * New setting in preferences dialog: drums MIDI channel * Selection of drums instrument, for GM, GS and XG standard devices * Show percussion names above the piano keys in drums channel * Moved the "show note names" option from preferences dialog to view menu * Extra controls: new button types for one shot controllers and SysEx messages Copyright (C) 2008-2009, Pedro Lopez-Cabanillas License: GPL v3 More info http://vmpk.sourceforge.net Downloads http://sourceforge.net/projects/vmpk/files openSUSE build service, RPM packages http://software.opensuse.org/search?baseproject=ALL&q=VMPK Regards, Pedro

15 years, 4 months

Re: [LAU] jack/firewire block apps from using buildin soundcard

by Atte André Jensen

Danni Coy wrote: > I would tend to think that the fact that qjackctl is a coincidence and > something else has grabbed exclusive access to the onboard soundcard. I don't think so. The moment I start qjackctl the problem is there, the moment I close it the problems gone... > I am using a very similar setup at home and I can use the onboard > soundcard at the same time that jack is running. But typically only one > application gets it at the one time. I've been doing this for ages, too... -- Atte http://atte.dk http://modlys.dk

15 years, 4 months

rtc/rtc0 + permissions + frequencies + udev

by james morris

I've been struggling with setting up the real-time-clock. It's taken me a long time to find the right information. And I'm still having problems with udev though. Here's a messy jumbled collection of stuff I've found out: Firstly, setting the frequency of the real-time-clock: from linux-2.6.31.6/Documentation/rtc.txt: Linux has two largely-compatible userspace RTC API families you may need to know about: * /dev/rtc ... is the RTC provided by PC compatible systems, so it's not very portable to non-x86 systems. * /dev/rtc0, /dev/rtc1 ... are part of a framework that's supported by a wide variety of RTC chips on all systems. ... Old PC/AT-Compatible driver: /dev/rtc ... Programming and/or enabling interrupt frequencies greater than 64Hz is only allowed by root. This is perhaps a bit conservative, but we don't want an evil user generating lots of IRQs on a slow 386sx-16, where it might have a negative impact on performance. This 64Hz limit can be changed by writing a different value to /proc/sys/dev/rtc/max-user-freq. Note that the ... New portable "RTC Class" drivers: /dev/rtcN -------------------------------------------- (( ie what I have, and probably others do too if they're running a new kernel )) Because Linux supports many non-ACPI and non-PC platforms, some of which have more than one RTC style clock, it needed a more portable solution than expecting a single battery-backed MC146818 clone on every system. Accordingly, a new "RTC Class" framework has been defined. It offers three different userspace interfaces: * /dev/rtcN ... much the same as the older /dev/rtc interface *****-> /sys/class/rtc/rtcN ... sysfs attributes support readonly *****-> access to some RTC attributes * /proc/driver/rtc ... the first RTC (rtc0) may expose itself using a procfs interface. More information is (currently) shown here than through sysfs. ------------------------ sysctl dev.rtc.max-user-freq no longer exists in the kernel https://bugzilla.redhat.com/show_bug.cgi?id=431163 basically telling us what I missed first time round in the kernel rtc docs, namely: max-user-freq is now located here: /sys/class/rtc/rtc0/max-user-freq and to set (until next reboot): sudo echo 2048 > /sys/class/rtc/rtc0/max-user-freq Finally, How to set the RTC max_user_freq in newer kernels (permanently): http://www.ralree.com/2009/07/19/how-to-set-the-rtc-max_user_freq-in-newer-… "I found out today how to set the real time clock max frequencies in Ubuntu since they removed the possibility to do it from sysutil.conf from newer kernels. Add the following to your /etc/rc.local or another startup script:" sudo echo 2048 >/sys/class/rtc/rtc0/max_user_freq sudo echo 2048 >/proc/sys/dev/hpet/max-user-freq I only needed the first of these - /proc/sys/dev/hpet does not exist on my system. *********************************************** Secondly doing all that is not bloody good if when you do ll /dev/rtc* you discover /dev/rtc0 is not a member of the audio group: lrwxrwxrwx 1 root root 4 2009-12-15 14:49 /dev/rtc -> rtc0 crw-rw---- 1 root root 254, 0 2009-12-15 14:49 /dev/rtc0 Chances are you're running udev, so don't think you can simply: sudo chgrp audio /dev/rtc0 This is where I've not quite discovered a solution which does not get blasted away by a Debian (testing) udev update (so if you know how to do it let us know): do: sudo nano /lib/udev/rules.d/85-hwclock.rules and add the following line: KERNEL=="rtc0", GROUP:="audio" Again it took quite a lot of digging around to find that. Most information points to other locations. For example adding the above line to /etc/udev/udev.conf does not work. I had previously added a file containing the above line to /etc/udev/rules.d but as stuff in there is auto-generated... I'm 75% sure it was deleted on a udev update. Now I no longer get /dev/rtc: permission denied Hooray! James.

15 years, 4 months

jack/firewire block apps from using buildin soundcard

by Atte André Jensen

Hi When I have qjackctl open (doesn't matter if jack is started or not), applications (for instance firefox, vlc, what-have-you) cannot use the buildin soundcard. Vlc doesn't print any error in the terminal, it just sits there patiently waiting for me to close qjackctl. As soon as I quit qjackctl it starts. Anyone experienced this, and have a cure? NB: I'm running ubuntu 9.10 with standard kernel and qjackctl (and actually almost everything else) from the ubuntu repos. -- Atte http://atte.dk http://modlys.dk

15 years, 4 months

Amixer lowest level

by Peter Plessas

Dear List, when decreasing the master volume of my HDA-Intel [1] card using amixer: amixer set 'Master' 3- dB I can't get to minus infinity (silent). -46.50dB is the lowest possible value, and I can still hear sound coming from its output. I know that I can mute the output but want to do this with one single key shortcut (hence executing one command as the one above) to fade down the master volume until silence. Does anyone have an idea how to make this work? Is there a script around that queries the actual value of the master volume and decides whether to decrease it further or issue the 'mute' command from amixer? Thanks for any suggestions! PP [1]Intel Corporation 82801G (ICH7 Family)

15 years, 4 months

routing jack-midi to alsa-midi?

by Iain Duncan

Hi folks, I have a Firepod with midi on board. I got it working ( thanks to help from here ) and jack starts up, qjackctl shows its ports in the connect window. I'm stumped with how to route midi signals from the firepods midi port, which *only* appears in the jack-midi tab of connections, to the alsa-seq midi ports of the applications I want to control. I read this: http://wiki.linuxaudio.org/faq/start?redirect=1#qwhat_is_the_difference_bet… And it says that I can start qjackctl with three options for midi-in-jack: none, raw, and seq. Sounds like seq is what I want but I can't find anywhere in qjackctl to choose this. Thanks iain

15 years, 4 months

midi control of seq24

by Josh Lawrence

hi friends! I've got an edirol pcr keyboard that I would like to use to control seq24. the readme file that comes with the application explains that you can use midi to toggle patterns: * [midi-control] For each sequence, we can set up midi events to turn a sequence on, off, or toggle it. We see the following lines in the [midi-control] section: 0 [0 0 0 0 0 0] [0 0 0 0 0 0] [0 0 0 0 0 0] 1 [0 0 0 0 0 0] [0 0 0 0 0 0] [0 0 0 0 0 0] 2 [0 0 0 0 0 0] [0 0 0 0 0 0] [0 0 0 0 0 0] ... I have no idea what this means. here are my (somewhat random) questions: 1. is there an app that I can view what midi messages my keyboard is sending? 2. what does that snippet mean? what do I need to be doing with my keyboard? 3. nowhere does the file mention play start/stop. can anyone confirm/deny that start/stop functionality exists? thanks everyone! -- Josh Lawrence http://www.hardbop200.com

15 years, 4 months

KVM virtual machines and jack

by Reuben Martin

Does anybody know if it is possible to run a guest OS under KVM and have the ins and outs of the virtual audio device presented to that OS, interface with JACK on the host linux system? I've done a little googling on this but couldn't find anything. (mostly because "jack" is ambiguous, and "KVM" can mean a lot of things) -Reuben

15 years, 4 months

[OT] recommended partition manager ?

by Dave Phillips

Greetings, My laptop has seen a variety of installs over the past year, and I now have a fair amount of delegated but unused disk space. Is there a recommended procedure or program that can re-acquire that space for my Karmic installation ? I've never repartitioned a disk *after* an installation, so I'm a bit nervous about the process. Advice is needed and welcome. TIA, dp

15 years, 4 months

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Linux-audio-user December 2009