Linux-audio-dev November 2002

linux-audio-dev@lists.linuxaudio.org

87 participants
85 discussions

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, 5 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, 5 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, 5 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, 5 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, 5 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, 5 months

[linux-audio-dev] Re: [Jackit-devel] 2.4.20-rc1 + lowlat + preempt + alsa + jack = dead computer

by Stefan Nitschke

>From: Fernando Pablo Lopez-Lezcano <nando(a)ccrma.Stanford.EDU> >Is anyone out there trying out this combination?: > > kernel 2.4.20-rc1 > capabilities patch > low latency patch > preemptible kernel patch > almost current alsa cvs [20021028.170432 usa pacific time] > >If I start jackd and then use the freqtweak jack client I get a completely >dead machine in a very short time (from a few seconds to 10 or 20 >seconds). > >... > >Interestingly enough just the jack server running is not enough to kill >the machine. Adding a jack client (just tried alsaplayer, same problem as >freqtweak) kills the machine really fast. > I have excactly the same problem since i upgraded my machine to SuSE 8.0, which is based on: kernel 2.4.19-SuSE + capabilities patch + low latency patch. Stefan _________________________________________________________________ Surf the Web without missing calls! Get MSN Broadband. http://resourcecenter.msn.com/access/plans/freeactivation.asp

21 years, 5 months

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

by Paul Davis

i don't want to blow my moderator points this time, so get busy. there is lots of confusion, mis-information and general cluelessness in the responses so far. get to it, provide me with some stuff to moderate upward ... --p

21 years, 5 months

[linux-audio-dev] RE: linux-audio-dev digest, Vol 1 #127 - 2 msgs

by Brad Arant

Havent been receiving any news lately, please help. -----Original Message----- From: linux-audio-dev-admin(a)music.columbia.edu [mailto:linux-audio-dev-admin@music.columbia.edu]On Behalf Of linux-audio-dev-request(a)music.columbia.edu Sent: Saturday, July 27, 2002 9:00 AM To: linux-audio-dev(a)music.columbia.edu Subject: linux-audio-dev digest, Vol 1 #127 - 2 msgs Send linux-audio-dev mailing list submissions to linux-audio-dev(a)music.columbia.edu To subscribe or unsubscribe via the World Wide Web, visit http://music.columbia.edu/mailman/listinfo/linux-audio-dev or, via email, send a message with subject or body 'help' to linux-audio-dev-request(a)music.columbia.edu You can reach the person managing the list at linux-audio-dev-admin(a)music.columbia.edu When replying, please edit your Subject line so it is more specific than "Re: Contents of linux-audio-dev digest..." Today's Topics: 1. Re: runtime / compiletime processing proof of concept (Paul Winkler) 2. Re: runtime / compiletime processing proof of concept (Juan Linietsky) --__--__-- Message: 1 Date: Fri, 26 Jul 2002 13:00:10 -0400 From: Paul Winkler <pw_lists(a)slinkp.com> To: linux-audio-dev(a)music.columbia.edu Subject: Re: [linux-audio-dev] runtime / compiletime processing proof of concept Reply-To: linux-audio-dev(a)music.columbia.edu On Fri, Jul 26, 2002 at 01:21:46PM +0200, Maarten de Boer wrote: > Hello, > > Juan Linietsky (reduz on #lad) talked on #lad about an idea of > Benno to have processing graphs generate source code, compile > it on the fly, thus taking advantage of all compiled optimizations, > as an alternative to runtime processing. Especially for sample > based processing instead of block based processing this can be > very useful and a lot faster. John Lazarro tells me that sfront does something similar. He says it's described here: http://www.cs.berkeley.edu/~lazzaro/sa/pubs/pdf/wemp01.pdf --PW --__--__-- Message: 2 Date: Fri, 26 Jul 2002 14:38:40 -0300 From: Juan Linietsky <coding(a)reduz.com.ar> To: linux-audio-dev(a)music.columbia.edu Subject: Re: [linux-audio-dev] runtime / compiletime processing proof of concept Organization: Codenix Reply-To: linux-audio-dev(a)music.columbia.edu On Fri, 26 Jul 2002 13:56:55 +0200 Maarten de Boer <mdeboer(a)iua.upf.es> wrote: > > What i forgot to mention: > > The most interesting thing is that the code used for runtime, and > the generated code used for on the fly compilation is actually the > same! Which ensures that the result of runtime execution and > compiling generated code -> execution is the same, and everything > has to be written only once. > > maarten > Hi! Thanks for taking the time of writing a proof of concept program. So far from what i've been reading it seems ok (didnt have much time to check the entire code in detail) althought the real advantage of compiling such graphs is when they are very large and stack/buffer and indirection operations start to really slow it down. Still, even whith this, i get (please tell me if these are correct): realtime code: (./main) real 0m1.005s user 0m0.970s sys 0m0.030s runtime code: (./gen) real 0m0.435s user 0m0.370s sys 0m0.060s three seems to be quite a difference! Juan Linietsky --__--__-- _______________________________________________________ linux-audio-dev Mailing List Digest http://music.columbia.edu/mailman/listinfo/linux-audio-dev End of linux-audio-dev Digest

21 years, 5 months

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

by STEFFL, ERIK (SBCSI)

> -----Original Message----- > From: Josh Green [mailto:jgreen@users.sourceforge.net] > > > On Thu, 2002-10-31 at 19:09, Benno Senoner wrote: > > Perhaps old news but I saw these interesting USB MIDI > master keyboards > > > > http://www.harmony-central.com/Newp/2002/PCR-30-PCR-50.html > > > > I'm considering getting one so my questions are: > > > > - What's the status of USB MIDI on Linux ? Are such kind of > keyboards fully > > supported ? (eg transmit all the params as midi events or > use special USB > > message) > > > > - what kind of Note-on MIDI latency do these keyboards have ? > > (standard midi keyboards 1.1msec) > > > > thanks, > > Benno > > > > New news to me! I was thinking of getting an Oxygen 8 for use with my > laptop but was bummed about it not having a MIDI input or pedal > controls. Both of which I see are included with those 2 > keyboards. Looks > like I'll be getting one of those if they work in Linux of course :) the specs say they have midi in/out (in addition to usb) so they should work with linux, right? quote: "MIDI Interface (in/out), USB Interface" erik

21 years, 5 months

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Linux-audio-dev November 2002