Linux-audio-user October 2004

linux-audio-user@lists.linuxaudio.org

153 participants
223 discussions

[linux-audio-user] Latency issues with laptops

by Lee Revell

One of the JACK developers reported this problem on LKML and the reply was very interesting, this could explain a lot of the weird latency issues that laptop users are seeing. http://lkml.org/lkml/2004/10/11/182 The basic issue seems to be if your laptop has a broken BIOS which implements ACPI using SMM you are out of luck. Here is some more information on the problem (near the end of the page): http://www.infoworld.com/cgi-bin/displayNew.pl?/glass/bg112596.htm If ACPI causes you massive xrun/latency problems then you might have such a broken BIOS. If you are having weird latency problems with a laptop, even with ACPI disabled, try to see if it corresponds to the fan turning on or changing speed. If so then you might be screwed :-( There does not seem to be a lot of hope if you do have one of these broken machines. But we can at least identify the problematic laptops, complain to the manufacturers, and warn people not to buy them. Lee

21 years

[linux-audio-user] MIDI In on SB Live! Value

by Nathan Callahan

Anyone got any clues as to why I don't seem to be able to get any MIDI messages from the MIDI/gameport on my SB Live! Value? I've got an evolution MK149 keyboard hooked up to it with the supplied power/data cable (power seems to work, the lights come on), but when I hook up a midi monitor to any of the MIDI ports on the Live! in alsa, there don't seem to be any messages coming through at all. No config files, since I'm not sure which ones to post... Can do so if you need enlightenment. Thanks for reading my woffle

21 years

[linux-audio-user] Progress with 2.6.9-rc3-mm3-VP-T3

by thewade

I managed to get the 2.6.9-rc3-mm3 and thusly VP-T3 kernel built and running! I had to patch some files: To get mm3 alone working I had to patch a file that VP-T3 patches: http://marc.theaimsgroup.com/?l=linux-kernel&m=109714329614794&w=2 and start the kernel with the i8042.noacpi option. I am patching and building a new kernel that should not need the i8042.noacpi option: http://bugme.osdl.org/attachment.cgi?id=3838&action=view M problem now is that I have ganed NOTHING with respect to latency. This is what I run to do PD, and I still get xruns! sudo jackd -R -d alsa -d hw:1 -r 48000 -p sudo pd my .pdrc: -jack -rt -path /usr/local/lib/pd/externs -path /usr/local/lib/pd/extra -path /home/wade/pd/general -path /home/wade/pd -lib sphere~ -lib fftbin~ -lib zexy -lib Gem -mididev 1,2,3 -r 48000 -sounddev 3 -blocksize 1024 -channels 18 -audiobuf 8 What can I do to lower latency whilst eliminating xruns? When I load a very large patch the whole machine essentially locks up, sputtering and jerking with no response for minuets at a time. Thanks for the continued help with my troublesome x86_64 machine. All I want is a solid machine for performances... -thewade

21 years

RE: [linux-audio-user] room based reverb/echo

by Reuben Martin

>I'm looking for methods in Linux to add reverberation >to sounds (not necessarily in real time) using >controls based on room size and specifications. I've >found some LADSPA plugins that have simple controls >- - GVerb, Freeverb, and Stereo reverb - which would >work if I can't find anything else. Does anyone know >of any options of any sort that provide more complex >controls (room dimensions in three directions, damping, >placement of source and mic)? Thanks for any advice. TAP Reverb Editor: http://tap-plugins.sourceforge.net/reverbed/manual.html It may not have the exact _type_ of controlls you are describing but it offers a lot of complex control. -Reuben

21 years

[linux-audio-user] Drum pattern creation.

by isabellf

Hello, I'm looking for information on the art of drum pattern creation. I don't talk about "howtos" for various drum machines or sequencers, I know how to use these, I just suck at creating good drum patterns ;-( I do differrent styles of music , folk , rock , jazz, classic, experimental stuff, but no dance or techno stuff ( even though some of my folk music out of my sblive synth feels a little more techno than it should ... ). One of the first thing I should probably do is study drum and get a teacher or something, but I felt maybe some of you know some tricks: what to avoid , what can be used at will, how to create fills... I even though I could receive a pattern library full of examples. I currently use rosegarden4 sequencer, the matrix editor is nice for drum part edition, but I also have hydrogen and tk707. And also, if you think another list would be more appropriate, tell me which. Thank you Frank

21 years

[ Re: [linux-audio-user] Demudi looking good, soundcard advice?] *corrected*

by MarC

apologies. I wanted to answer the last email privately in Spanish but I didn't know that the default reply-to was addressed to the list. I make a short translation of the wothful points I commented right there: to repair the bug in the Demudi's keyboard of Languages different from English: xf86cgf -textmode and select "keyboard". and also I said that they 've already released the 1.2.0 version of Demudi, which works better than the betas and that there's good support on the agnula user list at www.agnula.org. that's it

21 years

[linux-audio-user] laptop alternatives

by Brian Redfern

It seems that the little "lunch box" form factor with a flat screen monitor is really portable but has the advantage of giving you control over the kinds of hardware you're using, as opposed to a laptop where you're at the manufacturer's mercy. I would think that your safest bet would be to convert a mac power book into a PPC linux machine, but building a little linux lunchbox machine would still be a lot cheaper than forking out $2000 for a powerbook, but that's still better than spending $850 on a paper weight.

21 years

[linux-audio-user] Lemur OSC controller

by Steve Harris

http://www.jazzmutant.com/lemur_overview.php As mentioned on the music-dsp list: http://aulos.calarts.edu/pipermail/music-dsp/2004-October/028390.html Not out yet, and no hint of pricing, but I want one so badly :) Will come with linux editing software, hope its open. - Steve

21 years

[linux-audio-user] Drum pattern creation.

by Alejandro Lopez

Hi Frank, I'm a drummer who has been studying and playing some of the genres you mention. Generally I'd say that the best sequenced drum patterns I've heard have been programmed by drummers with a few exceptions. I believe that you too can be one of these exceptions. If you are a performing musician, you will have drummer friends. If you are not, my advice is that you rely on a school of music. I'd like to give advice on what you should study in order to create nice patterns, rythms, loops and fills. It's not very different from actually studying the instrument to be honest. Rythms: you need to know the different rythms that drummers actually use when playing different styles! Best source, an experienced drummed friend. Failing that, a drums teacher. It can be explained over the internet how rock is usually played in 4 / 4, 8ths on the high hat, accenting the one, two, three, four notes and playing the remainder one-and, two-and, three-and, four-and as ghost notes, then the bass drum and snare could play alternate quarters. But many rythms, even standard folk ones for instance, are much more complex (even rock needs to be played in a richer fashion for interest sake). If you go for the teacher option, just make him understand what your goal is, so he or she will concentrate on typical rythms rather than on wrist exercises! Fills: you need to know the instrument and its technique for that. You will need to study rudiments in order to create interesting sounding changes, breaks, fills and so on. You will need to learn "snare rudiments" such as "single roll, double roll, paradiddle, flam" so you can translate those (mentally) to the different elements of the kit, then to the sequencer. Mind you are lucky that at least you don't need to do it in real time like us performing drummers :-)) The method we've all used to develop our technique is one by Budy Rich called something like "Snare rudiments". If you have your drummer friend or teacher explain how to use one of these books, I guess a few hours of lessons should be enough for you to understand how it all works. Then you will need to translate your strokes to MIDI velocities in such a way that it sounds good. My experience is that you get best results by translating real strokes from real fills, one by one. For instance, you may have a fill consisting of 8 16ths snare strokes. Some people would sequence the velocities for these notes by making a linear "ramp" (quiet to loud). Well it sounds crap. One way that sounds good (the one I know) is to try to emulate the drummer. On usual 4 / 4 tempos, you usually play that in the snare by using an unfinished 9 stroke double roll, that is R R L L R R L L (R for right hand, L for left hand). To translate that, you will need at least 4 different velocities. If we name them A to D, being A the loudest, you will then sequence A - C - B - D - A - C - B - D. Reason is the drummer will rather naturally accent the notes that way so tempo is kept even for fast rolls. The rudiment is like that so good tempo and nice swing can be achieved naturally. In order to work out the way it is actually played, you need this book of so called "snare rudiments" plus a pair of drum sticks to tap on.. anything, really. Best luck!! Cheers, Alex _________________________________________________________________ Acepta el reto MSN Premium: Correos más divertidos con fotos y textos increíbles en MSN Premium. Descárgalo y pruébalo 2 meses gratis. http://join.msn.com?XAPID=1697&DI=1055&HL=Footer_mailsenviados_correosmasdi…

21 years

Re: [linux-audio-user] 2.6.9-rc3-mm3 no keyboard error

by thewade

Quoting Mark Knecht <markknecht(a)gmail.com>: > On Tue, 12 Oct 2004 20:33:03 -0600, thewade <pdman(a)aproximation.org> wrote: > > Im trying to get a VP kernel to build on my AMD64 laptop. I get a kernel > > Aieee when I try to boot 2.6.9-rc3-mm3-T3 so I decided to try mm3 alone. > > > > When I try to boot, it boots fine except my keyboard is disabled. > > What are you booting to? Are oyu booting to a runlever 3 equivalent > where there is no graphical display? Or are you booting to a runlevel > 5 equivalent where X is running. No, just to command line. I run startx to get to windowmaker. > I\'m thinking that the answer for these two runlevels might be > different. (I.e. - when X is up the keyboard is controlled by your X > configuration file... But kudzu runs in that command-line menuing system like menuconfig for kernels, so that is not xwindows... I cant even hit caps-lock and get my little green light to come on! 2.6.9-rc3 works 2.6.9-rc3-mm3 doesnt like my keyboard 2.6.9-rc3-mm3-VP-T3 gives me kernel Aieeee All on Fedora Core 3 test 1, AMD64 laptop Standard kernel with patches and g(libc,cc)-3.4.1-10 Poop! Thanks for the help! -thewade

21 years

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Linux-audio-user October 2004