Linux-audio-user August 2005

linux-audio-user@lists.linuxaudio.org

169 participants
209 discussions

[linux-audio-user] hello gentoo? speed up please...

by Aaron Trumm

hello all - got a question - I've only recently been stopping and taking a look at my studio computer's performance and in the almost year since I change from Red Hat 9 to gentoo, it's been more solid on some things, but I notice a huge latency difference - ie: I have to run Jack at -p 8192 to get anything done in Ardour Anybody have any tips on what to look at to tweak it? Seems like it should do better than that... I didn't see it as a problem until in the last few days I started playing with playing softsynths live directly into Ardour - you've gotta be running at -p 1024 or there's a latency that screws up your playing - at 8192 it's a downright 8th note delay... Here's some vitals that I can think of: OS: gentoo 2.6.6-rc1 kernel (alsa built in) jack: 0.99.0 ardour: beta28 jack command line: jackd -R -d alsa -d hw:0 -r 48000 -p 8192 <------- (or whatever) harddrive: multicount on io support: 32 bit unmaskirq on use dma on keepsettings off readonly off readahead on chip: 2ghz amd (I THINK - not at computer now) ram: 512MB thanks for any ideas! :) --------------------- Aaron Trumm www.nquit.com -----------------------

16 years, 7 months

[linux-audio-user] [offlist] Re: Mellotron sounds

by Juhana Sadeharju

>From: Neil Durant <lists(a)sphere3.co.uk> > >I'd be happy to sample the full lengths of all 35 notes for all six sounds, >storing them as wavs. I don't have a lot of spare time these days, so I'll >let someone else have the pleasure of cropping/editing! Please do so. Make the files available from your site or upload to ftp://ftp.funet.fi/incoming/audio/ Note: If we end up to conclusion that the samples cannot be put freely available, then I could make the samples privately available for the following kind of project. Research experts should analyse the sounds and come up with synthesis method which generates as similar sounds as possible. I'm aware of such research teams and I could ask them to analyse the samples. I also have a plenty of research papers on such analysis/synthesis methods. I could place the papers privately available for anyone who wish to write the analysis/synthesis software. Regards, Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

17 years, 3 months

[linux-audio-user] Announce for new Distro .....PClinuxOS" and Thac's packages

by Russell Hanaghan

Hi Folks, So, I have spouted off about a distro before (I know some of you checked it out) and it was not as good as I hoped it would be! :( Trust me...THIS is not the case this time!!! Announcing PClinuxOS (PCLOS for short) http://www.pclinuxonline.com/pclos/ This is based on Mandrake but minus the bloat! One ISO built as a LiveCD! You can boot it and not install...no commitment unless you want to. The install is simple as can be and fast. KDE 3.4, Fluxbox, Gnome, etc. The distro was started by Texstar who used to build packages for Mandrake a few years ago. So, whats that got to do with Music?? Just this; Thac has decided to start packaging for PCLOS just as he has with Mandrake. For those not familiar with his work... http://rpm.nyvalls.se/sound10.1.html I have relied on Thac's RPMS for audio since I started Linux audio work. He keeps his packages updated and has about everything worth having in his repositories. They have been invaluable to me. As recently as yesterday, Thac has started his own 3rd party Apt repository for PCLOS and as I write I am downloading the first of his packages and new mm kernel, etc. We are chatting on the Pclinuxos IRC chat room and ironing out a few minor bugs. It will be a few days before he has all of his packages done. Texstar suggested that we might make a liveCD with the key audio apps and a R/T kernel for easy usage and evaluation. Obviously some time is needed to work the bugs out but this is very likely in the not too distant future! I should think those of you working with MDK right now would see this as an easy step....others...well, the proof will be in the pudding. More soon.... R~

17 years, 7 months

[linux-audio-user] Range of instruments

by Emmanuel saracco

Hi, Where can I find a document about the usefull range ("texture"?) for each instrument? Thanks, Bye

17 years, 8 months

[linux-audio-user] alsa clients plugged into jackd with jackplug

by Esben Stien

I don't think I understand this jackplug concept. I'm trying to get an alsa client, such as aplay to play through jackd. I've setup jackplug in /etc/asound.conf pcm.jackplug { type plug slave { pcm "jack" } } pcm.jack { type jack playback_ports { 0 alsa_pcm:playback_1 1 alsa_pcm:playback_2 } capture_ports { 0 alsa_pcm:capture_1 1 alsa_pcm:capture_2 } } I then tell aplay to use: #aplay -d jackplug foobar.wav But aplay plays the file even if jackd is not started; why?. Isn't jackplug supposed to show up in my jack connections when aplay is playing? I seem to be missing something vital. Is there some way to make a "fake audio device", like hw:3,0 that alsa applications can connect to so that I can get the audio out and then send it through jack, process it and then send it to the real audio device? -- Esben Stien is b0ef(a)esben-stien.name http://www.esben-stien.name irc://irc.esben-stien.name/%23contact [sip|iax]:b0ef@esben-stien.name

17 years, 8 months

[linux-audio-user] [ANN] wiki.freeaudiosoftware.org online

by Christoph Eckert

Hi, finally the Wiki went online: http://wiki.freeaudiosoftware.org http://freeaudiosoftware.org currently is a simple redirect to the wiki. About this Wiki: The idea was that we have a Wiki to collect hints, tips and solutions we see in this list. Why a new domain? I often found useful hints in this list, but none of the existing wikis seemed to be on topic, so I stored info on my private machine only. It's a pity. So if you get valuable info from this list or want to contribute to the wiki in any way I'd be glad if the Wiki grew to a central place where users of free audio software will get a good starting point to get info about tutorials, software usage, an overview over important web pages and so on. I hope you like it and help making it worth the efforts. Best regards ce

17 years, 8 months

[linux-audio-user] My CD Player/Burner stopped working

by Mike Jewell

I have a Sony CD ROM in my Linux box. It has worked fine from the beginning but around the time I recently moved from Fedora Core 1 to Core 3 (Planet CCRMA), it stopped working for burning (using xcdroast) and playing through my Delta 1010LT sound card. The timing could be a coincidence but I suspect the setup got messed up somehow in the transition. If I put a audio CD in it, the sound comes out fine if I plug my headphones into the built-in (to the player) headphone jack but no sound comes through my sound card. My sound card is working fine for other apps like Audacity, Ardour, aplay, etc. Can someone help me figure out what might have gone wrong? Thanks in advance for any tips. Mike Mike Jewell

17 years, 9 months

[linux-audio-user] Music time

by james＠dis-dot-dat.net

Me again. More music: http://blog.dis-dot-dat.net/2005/08/stress-and-music.html Also includes sample breakdown. Why not take the same samples and do something different? Would be interesting... James -- "I'd crawl over an acre of 'Visual This++' and 'Integrated Development That' to get to gcc, Emacs, and gdb. Thank you." (By Vance Petree, Virginia Power)

17 years, 9 months

[linux-audio-user] Re: Resampling Audio Libraries & Sinc Resamplers

by davidrclark＠earthlink.net

Part 2 of (maybe) 3 For those with lack of familiarity with Fourier analysis and synthesis, here is a concrete example to demonstrate potentially serious problems with sinc resamplers in doing bulk conversions at constant rates. These problems are real and could easily result in audible artifacts --- something that I assume is of importance to Linux audio users --- and especially with further processing. ------------------------ File 123163main_cas-skr1-112203.wav is the NASA file recently mentioned on LAU --- a public-domain, taxpayer-supported WAV file sampled at 5000 samples per second. This file was chosen arbitrarily --- just happened to resample it before reverbing and posting for interested LAU'ers a while ago, so decided to use it for a comparison for Steve Harris. Two resamplers: 1) sinc resampler: $ sndfile-resample -to 44100 -c 0 123163main_cas-skr1-112203.wav \ saturn_sndfile-resample.wav 2) FFT with large windows: Sampster in Mixster (stuff I wrote myself) Comparison was every 50th sample in the original file with every 441st sample in the other two (should match exactly every 0.01 seconds) for the first 9.5 seconds of the files. 9.5 seconds was chosen rather arbitrarily --- nothing special about it. Ideally these particular samples should match exactly. Any error indicates corruption of the original data at the exact locations where the original samples were taken. The last two columns show you the difference between what is expected at these matching points and what was actually obtained after resampling. Note that the values in the last column are significantly greater than those in the next-to-last column. Match# Original FFT sndfile # FFT sndfile (diffs) 1: 0.00000 -2.00000 19.0000 1: -2 19 2: 386.000 384.000 437.000 2: -2 51 3: -181.000 -183.000 -178.000 3: -2 3 4: -500.000 -502.000 -538.000 4: -2 -38 5: -1065.00 -1067.00 -1068.00 5: -2 -3 6: -54.0000 -56.0000 -28.0000 6: -2 26 7: -120.000 -122.000 -55.0000 7: -2 65 8: -348.000 -350.000 -344.000 8: -2 4 9: 827.000 825.000 805.000 9: -2 -22 <snip> 344: -67.0000 -71.0000 100.000 344: -4 167 345: -378.000 -382.000 -275.000 345: -4 103 346: -37.0000 -41.0000 -101.000 346: -4 -64 347: -209.000 -213.000 -19.0000 347: -4 190 348: 269.000 265.000 86.0000 348: -4 -183 349: 62.0000 58.0000 27.0000 349: -4 -35 350: 427.000 423.000 446.000 350: -4 19 351: 154.000 150.000 -47.0000 351: -4 -201 352: 619.000 615.000 52.0000 352: -4 -567 353: -202.000 -206.000 111.000 353: -4 313 354: -366.000 -370.000 205.000 354: -4 571 <<< OUCH! Hope this doesn't get expanded. Over 100x larger error. 355: -146.000 -150.000 8.00000 355: -4 154 356: 549.000 545.000 558.000 356: -4 9 357: 279.000 275.000 -34.0000 357: -4 -313 358: -110.000 -114.000 -12.0000 358: -4 98 359: -184.000 -188.000 199.000 359: -4 383 360: -215.000 -219.000 -417.000 360: -4 -202 361: 244.000 240.000 74.0000 361: -4 -170 362: -474.000 -478.000 -152.000 362: -4 322 363: 188.000 184.000 562.000 363: -4 374 <snip> 938: -1448.00 -1449.00 -1468.00 938: -1 -20 939: -1203.00 -1204.00 -1161.00 939: -1 42 940: 3210.00 3209.00 3111.00 940: -1 -99 <<< about 100x larger error at 10% full scale 941: 5767.00 5766.00 5838.00 941: -1 71 942: -656.000 -657.000 -628.000 942: -1 28 943: -5165.00 -5166.00 -5163.00 943: -1 2 944: 1547.00 1546.00 1584.00 944: -1 37 945: 4410.00 4409.00 4445.00 945: -1 35 946: 1912.00 1911.00 1881.00 946: -1 -31 947: 5947.00 5946.00 5829.00 947: -1 -118 <<< Over 100x larger error at 18% full scale. 948: 5923.00 5922.00 5902.00 948: -1 -21 949: 3462.00 3461.00 3494.00 949: -1 32 What this shows is that at every 0.01 seconds, where the original file and the resampled file should have the same exact value (if the original data were preserved), large errors occur for sndfile- resample. ------------------------ resample-1.7 was even worse with a phase shift on top of this type of inaccuracy, coupled with rather serious spectral leakage beyond 2.5 kHz which was the original band limit (or might as well be assumed to have been). Upon examining the waveforms, I could see that resample-1.7 was doing an excellent job of tracing out the original waveform by drawing pretty much straight lines between points. Although visually reassuring, this actually adds spectral components that were not in the original. So it depends on what you want. This resampling probably won't sound like the original, but does look good in an editor. ------------------------ Also of interest is that the very latest version of sndfile-resample gives slightly different results than an earlier version for the locations which should match (the versions are for libsamplerate): Match# v 0.0.15 v 0.1.2 1: 19.0000 18.0000 2: 437.0000 436.0000 3: -178.0000 -179.0000 4: -538.0000 -539.0000 5: -1068.0000 -1068.0000 6: -28.0000 -28.0000 7: -55.0000 -55.0000 8: -344.0000 -344.0000 9: 805.0000 805.0000 10: -81.0000 -82.0000 11: 482.0000 482.0000 12: 78.0000 77.0000 13: 227.0000 227.0000 14: 501.0000 500.0000 15: 13.0000 12.0000 <snip> So the *amount* of corruption of the original data at locations which should match varies with version! Fortunately (or perhaps unfortunately depending upon your point of view) this latest version never varies more than 2 from the earlier version, so the "latest and greatest" is just as bad. The errors in the table above would be altered by 2 or less, which is insignificant.

17 years, 9 months

[linux-audio-user] lau illuminati

by Dan Easley

I've discovered the international symbol for the LAU Illuminati on, of all places, my very own web page. And I'm just a lurker! How dastardly! At any rate, here it is. http://towndowner.com/lau-illuminati.jpg well, I thought it was funny. I'm a terrible photoshopper, and I've been reading way too much fark/somethingawful. this mailing list and its participants are fantastic - i read and learn from you guys every day - thank you. keep illuminatizing! -- dan easley (dan(a)burntpossum.com) prabob

17 years, 9 months

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Linux-audio-user August 2005