Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

3 participants
7439 discussions

by Stuart Allie

Steve wrote: > Date: Sun, 3 Nov 2002 16:39:02 +0000 > From: Steve Harris <S.W.Harris(a)ecs.soton.ac.uk> > Yeah, I'm thinking we're not tackling it right, if behringer can knock out > a virtual amp harware box for E150 it can't the that cycle hungry. There's a good chance I could get my hands on a Behringer V Amp 2 for as long as I need it. If I did, I'd be able to run whatever signal I liked through it and try different amp/speaker settings, different gain levels, etc. and produce a lot of data that would hopefully be of use in trying to produce some sort of "amp modelling" ladspa plugin. I'm open to suggestions as to what would be the most useful things to measure, and what to vary across measurements. My first thoughts were: - a range of pure tones, say starting at 440Hz and going up 3 octaves, - ~5 gain levels, - ~5 amp/speaker simulations, That'd give us 100 "data points" to work with when it comes to testing our models. Comments anybody? Stuart

21 years, 10 months

[linux-audio-dev] Help on threads needed

by Dave Griffiths

Hi all, I'm just trying to tweak SpiralSynthModular's threads to be a bit more efficient, and I can't seem to find much info regarding thread priorities and such. I have two threads, a GUI one and an audio one. I can hand the audio thread over to Jack which works fine, but I'd also like to be able to run ssm in normal user mode and standalone without jack. I think I have two questions: 1. Is there any way to prioritise the threads running as a normal user (SHED_OTHER) my man pages suggest not, which is quite annoying. Should I "nice" the GUI thread down in priority? 2. What is the correct setup for SHED_FIFO? What priorities should I run the audio and GUI threads at, and should the GUI thread use SHED_FIFO too? Thanks for putting up with my ignorance :) Dave : www.pawfal.org :

21 years, 10 months

Re: [linux-audio-dev] Re: [ardour-dev] hardware requirements...

by Patrick Shirkey

How did this end up here? Anyway based on the discussion had so far in this thread I have updated the JACK user Howto to be more precise and yet somehow broader and muddier at the same time :) -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== "Um...symbol_get and symbol_put... They're kindof like does anyone remember like get_symbol and put_symbol I think we used to have..." - Rusty Russell in his talk on the module subsystem

21 years, 10 months

Re: [linux-audio-dev] ok, jump on slashdot right now, ALSA story in progress

by Patrick Shirkey

>I wouldn't go as fas as to blame any developers for this. ALSA is being >integrated in the mainline kernel and that by itself should keep >everyone busy. >I think its somehow the duty of the people who figured out how to >configure it in an easy way to write it up (cfr. Patricks quicktoots >section). >I'm willing to do just that. >The question is, what is the best place to write these things up ? >Do I start to work on Debian specific documentation, or is it better to >help on some general alsa documentation ? I think it would be best to have this info in the alsa-docs. Here's what I consider still needed to make the alsa-docs complete: - A paragraph on using alsaconf. - Anything that is distro specific. Although it might be better to make a page for this which people can add notes to. - Any info on using the controls for cards that have them. Specifically adat, wordclock, optical. I would like to have a section in the template for this but don't have any cards that use these so cannot test myself. -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== "Um...symbol_get and symbol_put... They're kindof like does anyone remember like get_symbol and put_symbol I think we used to have..." - Rusty Russell in his talk on the module subsystem

21 years, 10 months

Re: [linux-audio-dev] Interesting USB MIDI master keyboards, do they

by John Lazzaro

work with Linux ? > Tim Goetze <tim(a)quitte.de> writes: > > there's a difference though: the usb 1 ms is jitter, there's no way > to reconstruct the original timing. this in contrast to midi, where > you can extrapolate the exact event time quite well (provided you're > looking at a stream of mostly isolated events). oh well, most people > think 1 ms is below human perception limits anyway. People who are into this topic might want to take a few minutes to review Appendix C.1 (pp 66-70) of the MWPP draft: http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-mwpp.txt It basically describes the three methods MWPP provides for coding timestamps onto MIDI commands when packetizing a MIDI stream. The goal is that whatever your MIDI source is (a MIDI 1.0 DIN jack, an algorithmic composition program, etc), one of these three methods will be the right one to capture the timing as best as can be, into an RTP packet. Feedback is welcome on the topic, we're starting to close in "Last Call" for the document, but there is still a few months left ... ------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -------------------------------------------------------------------------

21 years, 10 months

Re: [linux-audio-dev] Interesting USB MIDI master keyboards, do they work with Linux ?

by Benno Senoner

Hi, I meant of sending midi events from the master keyboard via USB to the PC which runs an internal soft-synth/sampler. In that case USB should improve timing because of the bigger bandwidth, (but will add 1msec of latency due to USB1 polling mechanism as far as I can understand). Correct me if I'm wrong. cheers, Benno You wrote: ----- > Ok if the Edirol keyboards support standard MIDI then there shouldn't be any > problems using them under Linux, but since USB has a much bigger bandwidth > than serial MIDI, I that the timing for notes that belong to large chords is > more precise. Can someone confirm this ? Not really, unless you are spreading those chords on several separate midi outputs. If it just one, then it determines the bandwidth available. Getting things faster to the interface will do nothing because it still has to send the bytes to the external synth at the same old slow 31250 baud speed. ----- -- http://linuxsampler.sourceforge.net Building a professional grade software sampler for Linux. Please help us designing and developing it.

21 years, 10 months

[linux-audio-dev] [admin] massive spam attack

by Joern Nettingsmeier

there has been a massive spam attack against linux-audio-dev yesterday. expect longer round-trip times and even more anal filtering while i'm tracking this down. regards, jörn -- Jörn Nettingsmeier Kurfürstenstr 49, 45138 Essen, Germany http://spunk.dnsalias.org (my server) http://www.linuxdj.com/audio/lad/ (Linux Audio Developers)

21 years, 10 months

[linux-audio-dev] [ANN] rtsynth 1.8.0

by Stefan Nitschke

get the new "blue" version of rtsynth from: www.linux-sound.org/rtsynth/ enjoy, Stefan P.S. An updated jackified version will follow as soon as i can test it on my machine in RT mode. _________________________________________________________________ Internet access plans that fit your lifestyle -- join MSN. http://resourcecenter.msn.com/access/plans/default.asp

21 years, 10 months

RE: [linux-audio-dev] Interesting USB MIDI master keyboards, do t he work with Linux ?

by Benno Senoner

> AFAIK the Oxygen8 does not behave as a standard usb midi device, it uses a > "Midiman protocol" instead, so the standard drivers don't know what to do > with it. If you connect it and do an lsusb -v you don't see much... Ok if the Edirol keyboards support standard MIDI then there shouldn't be any problems using them under Linux, but since USB has a much bigger bandwidth than serial MIDI, I that the timing for notes that belong to large chords is more precise. Can someone confirm this ? BTW: the Midiman site lists Linux as an OS in their driver search page but nothing comes up when searching for product drivers. Is their stance very closed ? Do they not even release specs ? cheers, Benno -- http://linuxsampler.sourceforge.net Building a professional grade software sampler for Linux. Please help us designing and developing it.

21 years, 10 months

[linux-audio-dev] re: chebychev

by Bill Schottstaedt

> good god. know an alternative source for calculating the > coefficients? Bill? The classic article, in this context, is "Digital Waveshaping Synthesis" Marc Le Brun JAES 1979 April, vol 27, no 4, p250 Daniel Arfib, at the same time but independently, did similar work -- I don't know a reference. I think DiPoli wrote a good overview -- perhaps in Roads "The Music Machine"? CLM has code both for the table-oriented and polynomial-oriented approaches. There's an example "brighten" instrument in clm.html.

21 years, 10 months

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Linux-audio-dev