Linux-audio-user January 2012

linux-audio-user@lists.linuxaudio.org

133 participants
123 discussions

Re: [LAU] Terratec DMX 6fire 24/96 intermittent static

by Tvrtko Ursulin

It may have been a hardware problem, but not the sound card. I ended up measuring latencies using cyclictest which was giving me shocking numbers. At the end (cpufreq, rt kernel were in between attempts) it ended with disabling C1E CPU state in the BIOS. For the record it is a Phenom II X2 CPU on a AMD 785G motherboard. Tvrtko

12 years, 11 months

Re: [LAU] choir effect

by Renato

On Fri, 13 Jan 2012 18:33:47 +0000 Alan Russell <ajrussellaudio(a)gmail.com> wrote: > Could you please post an audio example for those of us without sox > installed? > original: http://dl.dropbox.com/u/31320832/snare.wav "choired": http://dl.dropbox.com/u/31320832/20snares.wav I'll probably take these down in a while since I have no idea where I got the original sample and it's license cheers, renato

12 years, 11 months

[OT]: Hybrid SSD disks

by Lorenzo Sutton

Hi all, I've lately heard of so-called hybrid ssd disks and was wondering if anyone has experiences with them esp. relating to audio, but also for general use. While advantages (and drawbacks) of pure SSD are quite straightforward, but the price tag is still high, I'm not totally convinced of the advertised 'advantages' of the hybrid ones. On the more linux side of things, one aspect which is not very clear to me is compatibility, especially what sort of software hackery the 'adaptive' optimisations include and to which extent these are Windows/Mac only, e.g. one of the popular brands states Linux compatibility and in the spec. sheet "Can be used with Linux" I was also thinking that this probably relates mostly to the laptop universe, as I guess one could create a 'homemade' hybrid system on a workstation with multiple drive slots by simply getting a smaller (now reasonably affordable) SSD disk for the system and keeping a traditional platter one for, say, storage etc. Lorenzo.

12 years, 11 months

Q: educational websites/books on comp. audio/recording in general

by Chris Metzler

Hi. The thread from my previous questions, which arose from researching what audio interface to get, evolved into a possibly-off-topic Q&A on more general (that is, non-linux-related) audio and recording stuff. To avoid posting more off-topic stuff into the mailing list, I'm wondering if folks could offer their personal recommendations on educational sources (books, websites, etc.) about (home) recording, pro audio for relative neophytes, etc. I am familiar with the "PC Home Recording for Dummies" book and very little else. I've found other stuff by googling; but I'm curious as to what people here particularly recommend. Thanks much, -c -- Chris Metzler cmetzler(a)speakeasy.snip-me.net (remove "snip-me." to email) "As a child I understood how to give; I have forgotten this grace since I have become civilized." - Chief Luther Standing Bear

12 years, 11 months

Terratec DMX 6fire 24/96 intermittent static

by Tvrtko Ursulin

Hi all, By looking at the archives this seems like it could be the right list since I see a lot of people with a lot of domain experience here. I recently acquired a second hand PCI sound card from the subject and am having some sound quality issues which seem difficult to understand. It is a Envy24/ICE1712 (snd_ice1712) based cards and comes with a 5.25" IO module, although that is probably not relevant. Issue is that when playing something through it, there is intermittent static like distortion in high frequencies. It is not regular, it's character changes but I am unable to correlate it to any externals. * It happens regardless of whether I am sending audio directly via ALSA (directly to hw:0 or not), or with jackd running. * It happens on PCM out 0&1 and 2&3 (haven't tried 4&5 yet) routed directly to HW0&1 etc. * It is not triggered by DAC output level (Analog Volumes page) * Sound coming from line-in, mixed via Digital Mixer is not affected, while simultaneous PCM out mix-in is. * When playing silence issue does not show. * Distortion volume seems to perfectly track sound volume. Whether I play with DAC output levels or actual PCM source level. As far as I understand this chip set, since Line-in through digital mixer is not affected, this rules faults in: * digital mixer * DAC * analog output stage What is left? Something on the driver side? Unreported under/over runs? Something else? Interrupt line is not shared with anything else and nothing unusual gets reported in the kernel logs, or by jackd. Would it help if I recorded the distortion and shared it? Many thanks, Tvrtko

12 years, 11 months

Pot rust

by jonetsu

Hello all, Hardware related. For quite some time I had the volume knob fixed at one setting on the M-Audio Studiophile speakers, using the headphone jack connected to a pair of Sennheiser remote headphones with their own volume control (plus any software volume controls). Recently when I tried to use the M-Audio speakers w/o headphones I was surprised to find that the volume knob has what I call 'rust' as it makes a loud noisy sound when rotated. Is there any fix for this ? I kind of recall that there was some kind of spray that was sold at Radio Shacks way back then to remove the 'rust' off potentiometers. Anyone got the same problem ? Are the speakers casings to be opened to spray such stuff or can it find its way from the small spacing around the knob at the front ? And is this stuff still around anyways and does it work at all ? Cheers.

12 years, 11 months

list statistics needed

by Dave Phillips

Greetings, I need to know how many members are signed up for LAU and LAD mail lists. Can someone point me to that information ? Best, dp

12 years, 11 months

another pair of ears desired

by Julien Claassen

Hello everyone! I'm just finishing my latest piece, which is sort of an orchestral work and I was wondering, if anyone might be able to lend me an ear for the final mix. this is the first time I've really done this. I generally tried to use the few effects in very subtle amounts, but I'm still not quite sure. f anyone is up for a bit of listening, criticising and suggesting, then please drop me a mail off-list and I'll send you a link. Warm regards and thanks Julien =-=-=-=-=-=-=-=-=-=-=-=- Such Is Life: Very Intensely Adorable; Free And Jubilating Amazement Revels, Dancing On - FLOWERS! ====== Find my music at ====== http://juliencoder.de/nama/music.html ..................................... "If you live to be 100, I hope I live to be 100 minus 1 day, so I never have to live without you." (Winnie the Pooh)

12 years, 11 months

Re: [LAU] /dev/rtc permissions on Debian

by rosea.grammostola

On 01/10/2012 01:00 PM, linux-audio-user-request(a)lists.linuxaudio.org wrote: >> > You might have your settings for the maximum value set too low. What does >> > the following show: >> > >> > $ cat /sys/class/rtc/rtc0/max_user_freq >> > >> > On older kernels that should be: >> > >> > $ cat /proc/sys/dev/rtc/max-user-freq >> > >> > Also relevant: >> > >> > $ cat /proc/sys/dev/hpet/max-user-freq >> > >> > You can set these values like this: >> > >> > $ sudo echo 2048> /sys/class/rtc/rtc0/max_user_freq >> > $ sudo echo 2048> /proc/sys/dev/hpet/max-user-freq >> > >> > or set them in /etc/sysctl.conf >> > >> > HTH Ralf Mattes >> > > Hello, > > How does this all relate to the snd-hrtimer ALSA module? Or is this a > software timer while hpet and rtc0 are hardware timers? This is a bit > uncharted territory for me and I like to get things straight for the > LinuxMusicians system configuration page > (http://wiki.linuxmusicians.com/doku.php?id=system_configuration), and > also for myself as I use MIDI a lot (Qtractor, seq24, Hydrogen etc.). > > Best, > > Jeremy > I did the echo commands and added the 40-timers-permission.rules file also, as described here: http://wiki.linuxmusicians.com/doku.php?id=system_configuration#hardware_ti… That made the error message go away in OOM

12 years, 11 months

Pulseaudio only software in a pure alsa/jack system (VSXU player)

by Nils

Hello, I would like to try out http://www.vsxu.com/ which is a graphic visualiser for music, a player and a creation program. Even if the website does not look like it, it is GPL. But somebody *** the devs in their brains and, at least the player, only receives/records music trough Pulseaudio which I do not want to install. Do you know any sane solution to emulate pulseaudio playback ports or send audio otherwise to this program (Without rewriting their audio subsystem. At least I don't want to do this.)? Nils

12 years, 11 months

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Linux-audio-user January 2012