Linux-audio-user December 2009

linux-audio-user@lists.linuxaudio.org

166 participants
190 discussions

by Folderol

This is a set of ZynAddSubFX tutorials produced by the man himself. I can recommend them all, and be prepared to be amazed :O http://www.youtube.com/user/zynaddsubfx -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

14 years, 10 months

Linux Audio Conference 2010

by Marc Groenewegen

Dear Linux Audio developer, user, composer, musician, philosopher and anyone else interested, you are invited to the... Linux Audio Conference 2010 The conference about Open Source Software for music and audio May 1-4 2010 Hogeschool voor de Kunsten Utrecht (HKU) Utrecht, The Netherlands Registration is open, and so is the call for abstracts and papers. More information can be found on the website: http://lac.linuxaudio.org/2010 For previous editions, look here: http://lac.linuxaudio.org For concerts, music and workshops a submission system and protocol will be available soon. In the meantime, ideas and announcements can be sent by e-mail ("lac -at- linuxaudio -dot- org ") or written on the wiki: http://wiki.linuxaudio.org/lac2010 We hope to see you all in Utrecht ! Kind regards on behalf of the LAC team, Marc Groenewegen, lecturer music software design @ HKU

14 years, 10 months

usb and jack

by rosea grammostola

Hi, I found this info: "USB and jack The USB interrupt period is 1 msec. To be able to get lower latency with jack when using it with an USB device, you have to use a setting as 48kHz and 3 period. It will makes the buffer time a multiple of 1 msec and you will get a much lower latency as with the default 2 period. Additionaly, loading the snd-usb-audio with the parameter "nrpacks=1" will give you a much lower latency (for this to work take care that CONFIG_USB_BANDWIDTH is not set and CONFIG_USB_DYNAMIC_MINORS is not set in your running kernel)." http://proaudio.tuxfamily.org/wiki/index.php?title=Howto_RT_Kernel#USB_and_… 1) is this info still up-to-date? 2) how do I exactly take care of this: "Additionaly, loading the snd-usb-audio with the parameter "nrpacks=1" will give you a much lower latency (for this to work take care that CONFIG_USB_BANDWIDTH is not set and CONFIG_USB_DYNAMIC_MINORS is not set in your running kernel)" (Debian (based) systems) \r

14 years, 11 months

A belated christmas song

by Julien Claassen

Hello all! This should have been ready before, but alas I couldn't get up to it. :-) The song is titled "Carlos' Night" and can be downloaded here; OGG version: http://juliencoder.de/nama/carlos_night.ogg MP3 version: http://juliencoder.de/nama/carlos_night.mp3 Instruments and software used: Of course Nama for recording and mastering, LinuxSampler for the piano, hydrogen for the drums, beatrix for the organ and my roland XP30 hardware synth for the mellotron string and choir and the bass. Enjoy and have fun Julien -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net the Linux TextBased Studio guide ======= AND MY PERSONAL PAGES AT: ======= http://www.juliencoder.de

14 years, 11 months

USB audio interface support?

by Ng Oon-Ee

Hi all, two quick questions (new to this list, let me know if I'm doing this wrong), 1) What's support like on Linux on the USB Audio Interfaces? Specific list below. I guess this is pretty much a 'does alsa support these devices', at the current moment? Obviously this is the primary requirement compared to 2). 2) I've got a Shure SM57 dynamic mic which needs amp-ing to get a useable signal for my laptop. Instead of just getting a pre-amp I was figuring I may as well get a USB audio interface, enabling me to finally use the MIDI output of my Korg as well as record a presumably good signal direct from my SM57. I've seen various complaints on the Fast Track Pro, for example, that the SM57 volume is just too low for quiet recording (ex. recording accoustic guitar), and its been confirmed as an issue by one of their engineers (http://forums.m-audio.com/showthread.php?t=14610). So the second question is, is this a general issue with the SM57 and budget USB audio interfaces, or would one of the list below be better? I'm looking at the following interfaces:- a) M-Audio Fast Track Pro b) Alesis IO|2 Audio/Midi Interface c) Tascam US-144 USB 2.0 Audio and Midi Interface d) Edirol UA-4FX USB Audio/MIDI Interface Please feel free to recommend alternatives with similar feature set (XLR input, 1/4" input, some sort of MIDI is a preferred bonus). Thank you all.

14 years, 11 months

resampling flash and gstreamer to 24/192

by Bearcat M. Sandor

Yesterday i asked for assistance figuring out how to get mpd + pulse audio upsampling to 24/192. The results are *fantastic* Bass is deeper and tighter, decay is longer and vocals are clearer. I don't know why. It kinda makes sense and it doesn't. It might all be in my head. Anyhow, now that MPD and pulse are set to 192 they sound great. However, gstreamer apps drop out after a few seconds, and sometimes pause for a few then come back in for 5 seconds, then pause, come back in for 5 seconds (playing at the right speed however). Flash (adobe not gnash or swf) stutters or doesn't come in at all. Is this a buffering issue or because *they* are playing at the (now) wrong bit rate? Setting pulse back to default fixes that but i'd really like to have gstreamer and flash resample to 192 to synch with pulseaudio. Looking around i cant figure out a way to tell my system "every thing you play with gstreamer, resample it to 192 first", and there's *nothing* on doing it with adobe flash. Any ideas or pointers? Do i need to have them resample or so i need to increase buffers (somehow) If i can't do it that preferred way, isn't there a way i can set up pulse so i can switch the bitrate back and forth with a toggle? If this is too much hand-holding or not appropriate for this mailing list just tap my muzzle and point it in the right direction. Thanks -- Bearcat M. Şandor Jabber/xmpp/gtalk/email: bearcat(a)feline-soul.net MSN: bearcatsandor(a)hotmail.com Yahoo: bearcatsandor AIM: bearcatmsandor

14 years, 11 months

Linux audio app design: The nature of xruns

by lanas

Nature of xruns I never paid attention to mentions of xruns since I rarely got them using a stock Fedora 8 kernel (and F6 before that) on a x86_64 architecture, 4GB RAM. Yesterday though, I got plenty of them and my observation is that in this case any real-time feature associated to the kernel does not matter. In this case the xruns are made by the way applications handles stuff (whatever that is). So that makes me think that there ought to be a guideline, a best practices in developing Linux audio/jack applications. Here's the observation setup. First, the song. The song does not matter, It always plays fine. The song is made by the use of Seq24 which drives several soundfonts loaded by Qsynth in different engine instances, as well as two sounds made by Zyn. Qsynth has several instances of FluidR3_GM (120MB) and one SGM (250MB) loaded. Second, the xruns. I take the outputs and drive them through jackmix, add electric guitar line-in from a Vox amp, and have the outputs of jackmix feed into Qarecord. Start recording. The .wav result is polluted with xruns. Third, same song w/o xruns. I terminate jackmix and Qarecord and launch Ardour. I run all outputs into Ardour, and run the electric guitar as well. Add some Freeverb and MultiEQ. Record. No xruns at all in the resulting .wav file. From this it is obvious that the application layer helps a lot in promoting xruns. It is safe to assume that Qarecord is a quick hack. But, there's seemingly a big difference in application design regarding the handling of audio/jack stuff between Qarecord and Ardour since one produces a festival of xruns and the other none. My question is, is there a guide/HOWTO around that addresses the proper design of audio/jack applications or, is - in 2009 - the only to know about that is by actually going through the source code of successful Linux audio/jack applications ? Cheers.

14 years, 11 months

rpm challenge 2010

by Atte André Jensen

Hi I missed the rpm challenge 2009, and I'm eager to join this year. However the website (http://www.rpmchallenge.com/) still doesn't mention 2010 and have 2009 all over the place. Anyone knows what's up? Will there be a rpm10 or? How about last year, when was it possible to join the challenge? -- Atte http://atte.dk http://modlys.dk

14 years, 11 months

multi-channel recording

by Edward Barrow

I've been getting by so far with an amd64 box running debian, jack, ardour etc through Terratec DMX-6fire (Envy24 based) card, but now find that I need to record more channels simultaneously. I would like (and can just about afford) the M-Audio FastTrack Ultra, but it doesn't look as though it is going to be easy to get it to work under Linux. It's a USB 2.0 device - it needs those 480Mb/s to record 8 channels simultaneously - so it isn't class-compliant. Has anyone succeeded in getting this interface to work properly in Linux? If not, can anyone suggest alternatives in the same sort of price range? Thanks, Edward

14 years, 11 months

Value of low-latency in audio?

by david

Just wondering. Without an RT kernel here, my 2 laptops seem to run my simple audio needs pretty well at 64msec latency. At least, it's never bothered my playing along with computer-generated audio. I don't do any heavy-duty audio work here. Once I tried Jackrack, put one effect in it (that worked) or one amplifer (that worked) but trying to use both didn't. But I don't know if that had so much to do with latency or lack of RT kernel as with a smallish amount of memory and an underpowered processor driving the whole thing. Now that I''ve upgraded the memory on both laptops, perhaps it would work? On musicbox, with 512MB, using a single good quality (larger) soundfont was enough to cause problems. With 768MB in it, it works without problems. I see people on the list running much lower latencies than 64msec, and seemingly trying to get even lower ... So, just wondering. -- David gnome(a)hawaii.rr.com authenticity, honesty, community

14 years, 11 months

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Linux-audio-user December 2009