Linux-audio-user February 2005

linux-audio-user@lists.linuxaudio.org

173 participants
197 discussions

[linux-audio-user] Bass boost and Reverb

by Mark Constable

If anyone cares to comment about this I would appreciate it and it could be useful for other DAW novices. First, the bass boost for 2 seconds here just rocks my socks... for my tastes it is perfect. Could anyone literally describe the technical details of what it would take to get the kind of bottom end specifically from 32 to 34 seconds, the first brief sound part ? http://homepage.mac.com/hschot/PodCasts/HijackEffectsTest-050203.mp3 (the last 1/3 is over the top rubbish) Secondly (shudder), the reverb applied from 40 seconds to 1:10 is also excellent. I don't care if it's real or the sound of a forest, it just sounds commercially 'ken excellent to my ears. Could anyone advise me how to get pretty well exactly that kind of reverb on our favourite tux powered OS with that same clarity and transparency ? All the reverbs I've heard so far (but with minimal exposure to all LADSPA plugins) sound unnatural and somewhat like "down a drainpipe". --markc

19 years, 3 months

[linux-audio-user] Jackit and Jamin CVS access

by Christian Schumann

Hi, since a couple of days I have not been able to get anonymous CVS access to Jackit and Jamin. The login just times out. Can anybody confirm this issue or comment on this? Regards Christian Schumann -- ------------------------------------------------------------------------ Dipl.-Phys. Christian Schumann |Technische Universitaet Kaiserslautern Mail: schumann(a)physik.uni-kl.de | Fachbereich Physik Tel.: 0631/205-4842 | http://www.physik.uni-kl.de Fax.: 0631/205-3902 | Post: Erwin-Schroedinger-Strasse, D-67663 Kaiserslautern -------------------------------------------------------------------------

19 years, 3 months

Re: [linux-audio-user] Re: Decent reverb

by davidrclark＠earthlink.net

Hi Bob, As I mentioned to Tim, I also have uses for over-the-top reverb, just not applied to room modelling. > Can't say I've had a lot to do with Synth reverbs, I come from a ' live' > sound engineering background so tended to use reverbs very sparingly. > As a recording engineer and moving to digital this is a different ball > game. I think it really depends on the type of music you are aiming for. Yes it does depend on the type of music, but again, most any kind of music sounds better in a good room where "good room" is up to you to design. As a live sound engineer, you probably chose specific venues for recording. > I must admit to struggling with reverb settings as they sound ok one > minute and then not the next as the track moves on. I'm just guessing, but with your experience in live recording, you're probably very sensitive to errors in the physics. As you know, there are simplistic approaches used for reverb, echo, and stereo separation. Although you can set all this optimally for one instrument at a particular time, the settings don't extrapolate to other cases well at all because the modelling is physically incorrect (it's signal-based). If you have a good math background, then you probably know that tuned polynomial models of things usually fail miserably outside the tuned space --- sometimes within the tuned space. Same thing here. If you turn the effects down, as you're used to doing anyway, then problems probably are not as obvious. If you turn the effects way up, then you have a new instrument, and it may sound OK. You're no longer attempting to simulate a room with a weak model. This discussion probably doesn't help you too much as a working engineer, but perhaps in the not-too-distant future, other methods will be developed which change the methodology or at least offer marketable alternatives. Meanwhile, you'll probably develop a useful bag of digital tricks that work for your customers. Regards, Dave.

19 years, 3 months

[linux-audio-user] Problem with jackd

by pascal lawrynowicz

Hello, I've installed jackit-0.99.0-2mdk.i586.rpm and qjackctl-0.2.14-1mdk.i586.rpm and try to start jackd and get the following error message : Patch bay deactivated Statistics reset MIDI connection graph change MIDI connection change Startup script artsshell -q terminate Startup script terminate with exit status=256 Jack is starting ... /us/bin/jackd -v R -dalsa -ddefault -r48000 -p1024 -n2 JACK was started with PID=9259 (0x242b) getting driver descriptor from /usr/lib/jack/jack_alsa.so getting driver descriptor from /usr/lib/jack/jack_dummy.so getting driver descriptor from /usr/lib/jack/jack_oss.so could not open driver '/usr/lib/jack/jack_oss.so': /usr/lib/jack/jack_oss.so: undefined symbol: jack_create_thread jackd 0.99.0 Copyright 2001-2003 Paul Davis and others Jackd comes with ABSOLUTELY NO WARRANTY This is a free softaware, and you are welcome to redistribute it under certain conditions; see the file COPYING for details registered builtin port type 32 bit float mono audio cannot lock down memory for jackd (operation not permitted) /usr/bin/jack: symbol lookup error: /usr/bin/jackd: undefined symbol: jack_create_thread JACK was stopped with exit status=127 what's the matter, can you help me? speak slowly I'm new with Linux See you,

19 years, 3 months

[linux-audio-user] Appropriate Directory Structure

by Tom Charles-Edwards

Greetings. I have just set up my first partition table. When you specify the mount point for each partition you can use your own title or one of those in the menu. I can't remember all of them, but they had names like / var, /tmp etc etc. Where can I find information about which of these I need to create partitions for and what they're supposed to be used for. Currently I have (ext3): / swap /home /audio I guess when I'm installing software an arbitrarily structured partition table is likely to result in chaos something I'm naturally quite keen to avoid. Many thanks in advance, Tom -- Whatever you Wanadoo: http://www.wanadoo.co.uk/time/ This email has been checked for most known viruses - find out more at: http://www.wanadoo.co.uk/help/id/7098.htm

19 years, 3 months

[linux-audio-user] Warning: no locale found: /usr/share/locale/qjackctl_en_AU.qm

by vector

i keep getting this error when i start qjackctl its not an important thing but its bugging me tried reinstalling qjackctl but it didnt help:( any thoughts? if i could find a copy of the file id just stick it in there ;)

19 years, 3 months

[linux-audio-user] usb-usx2y driver

by Mark Constable

I'm using a configure for v1.0.8 drivers like this... ./configure --without-oss --with-sequencer=yes \ --with-cards=usb-usx2y but I keep getting... checking for which soundcards to compile driver for... configure: error: Unknown soundcard usb-usx2y and yet this URL clearly states it should exist... http://alsa-project.org/alsa-doc/doc-php/template.php?company=Tascam&card=U… Any suggestions ? --markc

19 years, 3 months

Re[2]: [linux-audio-user] Re: Decent reverb

by davidrclark＠earthlink.net

Hi Marije, Sorry I did not repost it previously: http://home.earthlink.net/~davidrclark/linux_audio_users The IR generator method I'm using is constuction of Green's functions using eigenfunctions. So far I've stuck to rectangular geometries, but do have a circular one (not posted but available). This method, in case you're not familiar with it, would be like ray tracing every possible ray throughout the entire geometry for a particular pair of source and solution points. However, it's usually limited to simpler geometries and boundary conditions, as you may know. Ray-tracing is good for more irregular geometries, but it's a lot like Monte Carlo techniques: You launch something and hope that it produces a useful result each time --- but usually produces a result that is similar to previous results. I'm sure there are optimizations that are done, just as with MC techniques, but I'm not familiar with what those might be. The useful ones probably somehow ensure that the ray goes very, very close to both source and listener fairly soon. But it seems that this would be difficult to ensure in advance for any rays other than the obvious ones. I would guess that this is a serious limitation on resolution for large rooms and high frequencies. It's also bound to be comparatively slow without rather extensive optimizations. Regards, Dave.

19 years, 3 months

Re: [linux-audio-user] Re: Decent reverb

by davidrclark＠earthlink.net

Hi Steve, Thanks for your comments on impulses, etc. My main concern was that, and I'm sure you know this perfectly well, that mathematical physicists are fond of saying about impulses, in the context of integration, that the shape of the impulse doesn't matter too much. It's a handy way to sweep away a difficult derivation! This is true for many physical phenomena. But in audio --- and again I'm sure you know this but others may not --- the ear is an extraordinarily sensitive detector, and audio includes many different physical situations, sometimes on very short time scales. So I think it's important to ensure that everyone understands that "doesn't matter too much" doesn't necessarily mean "isn't audible." --------------------------------- (The following is more specific, hopefully of interest to at least some LAUer's.) On my web page is a song "latest" that uses calculated IR's. Some software is there to produce them, also. But I know you're a busy guy! The song "latest" is for headphones, as usual. Long ago you and some others encouraged me to post the IR generators. They were so user unfriendly that I took some time to "put some lipstick" on them. Hopefully they're not too bad now. Regarding synthetic space --- ironically a problem with the Green's function technique that I'm using, the calculated IR's are a little too accurate. They have extremely sharp spikes, and the timing is very accurate. You can hear echos where you might actually hear more of a reverb (with actual diffuse reflections). Amplitudes can also become very large, yet the sound have very little power. Here again, I think that diffusion and diffuse reflections need to be incorporated, or something mimicing them. However, this accuracy produces crystal clear sound, and I find more and more that I like it compared to the mushy sound that a lot of audio software produces. Some reverb models sound hilarious to me because they're so physically erroneous. I can't hear the music over the sound of my own laughter. I'm not a big fan of ray-tracing at this time. It just seems to me that it's equivalent to a sparse grid without some sort of optimization or pruning method. But I have no experience other than reading technical articles. I've worked in the semiconductor industry with finite difference codes, so naturally it occurs to me to try and build a IR generator using that technique. Do you have any experience along those lines? Please feel free to contact me via email if you prefer, because that's probably not of interest to LAUer's. My crude estimates lead to a monstrous mesh and no chance of reducing the time step. This may be OK for IR generation... Thanks for any further comments. Best regards, Dave.

19 years, 3 months

[linux-audio-user] Voiceover project

by Jon Morin

Hi, I need to do some voiceover work, and I was wondering if there was an application or a set of apps to do this with Linux. The video I was given is an MPEG file, and I need to redo the voiceovers of the presentation. The only voiceover work I have done was in Windoze with Sonar 3, which I don't have access to anymore. I can think of a few ways of doing this (coming up with an EDL, recording the voice, and editing with Audacity or something). What I really want is an application that will let me easily replace the audio track of a video with another (preferably with a GUI). I know that I can use tools like mplayer to dump out just the video and mencoder to re-encode, but if there is an easier tool (more automated), I'd like to check it out. Thanks. Jon

19 years, 3 months

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Linux-audio-user February 2005