Linux-audio-user September 2004

linux-audio-user@lists.linuxaudio.org

161 participants
177 discussions

by Martin Rocamora

Hi. I'm tring to use a GNU/Linux machine as a real-time effects box (live - reverb, eq). I wonder if I could use real-time LADSPA plug-ins but with no X server (to improve latency). I mean something like JACK Rack but from a shell terminal. Thanks Martín.

20 years, 3 months

[linux-audio-user] A page to help others

by thewade

So now that my machine is %99 percent there I have made a page that represents my work so that others might get some help without asking all the questions I did: http://www.aproximation.org/application/AMD64laptop.html Its filled with misspellings and is not really complete. Only use will determine what actually works and what doesnt, but its a beginning at any rate. Im going to post this on a few other lists as well, so I appologize if you get this message more than once. Thanks for all your help! -thewade

20 years, 3 months

[linux-audio-user] using cat to send a MIDI string ?

by Dave Phillips

Greetings: I know this is possible but I can't remember how. I want to send this string to a MIDI device: f0 7f f7 06 02 f7 Anyone know the command syntax ? Best, dp

20 years, 3 months

[linux-audio-user] same kernel and big differences between mandrake and debian?

by rico

Hello everybody, I use mandrake and i want to switch to debian, i have mdk 10.0 and debian sarge currently installed. As a musician i use band in a box with wine alsa and timidity with the same kernel + config (stock 2.6.8 no preemption) on both system. However, the sound is great on mandrake whereas it is crappy (glitches, scratches, not regular) on debian (even trying the LD_ASSUME_KERNEL=2.4.22 trick). I don't use jack. How comes there is such a difference between two system that uses the same kernel and config? Where should i look since the kernel and modules are the same (are they?)? Thanks rico

20 years, 3 months

[linux-audio-user] MPlayer with JACK, compile problems

by Tommi Sakari Uimonen

Hi. I tried to compile the latest MPlayer (1.0pre5) with JACK output enabled (./configure did detect JACK after I installed the bio2jack, but not before) The compilation fails at linking giving me something about functions JACK_GetVolume JACK_SetVolume not found. It must be something with the bio2jack install, since it has those functions. Has anyone succeeded in compiling the MPlayer with JACK output enabled? Tommi Uimonen

20 years, 3 months

[linux-audio-user] Austin Get-together

by Bill Morgan

Several of us are planning to get together at the Dog and Duck this week. It looks like we'll be there around 6:00 PM on Thursday. We haven't discussed recognition signals yet, so stay tuned... Bill

20 years, 3 months

[linux-audio-user] es1370 latency and jackd, late driver wakeup

by Louis Lam

Hello All, I have a bunch of old consumer sound cards. SBLive, Vibra128 and ensoniq 1370(es1370). I went through quite a number of rounds trying out these cards and found that IMHO the es1370 gave me the best sound amongst these cards. So i went ahead and try to start jack according to the capabilities of this card. With this card, i find that once i start jackd like this: jackd -v -R -d alsa es1370 -r 44100 I get lots of xruns immediately. Then i tried with the n=4 (ie 4 periods per hardware buffer), i.e "jackd -v -R -d alsa es1370 -n 4" and I am able to get rid of the xruns. But i see lots of "late driver wakeup: nframes to process=2048" on the jackd output. What does this message mean? For recording into ardour, n=4 and the default frames per period (1024) gives me quite significant latency when recording. e.g when I pluck a note on the electric bass i can hear it on the line-in monitor first and then from the capture slightly later. As a compromise, i set the frames per period to either 64, 128 or 256. But I still get the "late driver wakeup" message and occasional xrun when i quit ardour or sometimes even hydrogen. I notice that when quitting jackd programs there will sometimes be a few xruns. Is this normal? Seems like ideal to start n=2 but this card don't seem to allow me to do that. I could be wrong but i think for low latency n=2 is ideal. If i have saved an ardour project with Tim Goetze's plugin activated in some tracks, ardour may report that it is too slow or (something like that) when i reload that project file. I suspect this is to do with some ladspa plugins requiring low latency which my setup is not able to give. I know this card is old, but it does give a great sound. I used SBLive previously and don't seem to have these latency issues (able to start jack with n=2). For owners of this card, any sound advice to get the most out of it? Thank You very much, Louis ________________________________________________________________________ Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now http://uk.messenger.yahoo.com/download/index.html

20 years, 3 months

[linux-audio-user] [ANN] Jack Audio Connection Kit 0.98.16 Release

by Taybin Rutkin

JACK RELEASE 0.98.16 JACK is a low-latency audio server, written primarily for the GNU/Linux operating system. It can connect a number of different applications to an audio device, as well as allowing them to share audio between themselves. Its clients can run in their own processes (ie. as normal applications), or can they can run within the JACK server (ie. as a "plugin"). JACK is different from other audio server efforts in that it has been designed from the ground up to be suitable for professional audio work. This means that it focuses on two key areas: synchronous execution of all clients, and low latency operation. JACK is available at http://jackit.sf.net --CHANGES-- Buffer resizing enabled by default. Added jack_ringbuffer_peak() to API. Added jack_last_frame_time() to API. --verbose will print the maximum usecs used on jackd termination. Better compatibility with NPTL. --version output changed for easier parsing. New --unlock/-u option so that large libraries (gtk, qt, fltk, wine) aren't memlocked. Jack's tmp files now have the uid appended to them, so if there is a crash, and then another user tries to use jack, it will still work. New jack_create_thread() cleans up threading for portability. Available for use by jack clients too. New CoreAudio driver from the Jackosx project included in jack tree. Prettier configure output. and of course, updated documentation, better error reporting, and misc internal fixes and cleanups.

20 years, 3 months

[linux-audio-user] Full Duplex with MAC OS / Powerbook / Audacity

by dave price

Greetings, I no this is not strictly (or perhaps vaguely) linux audio related, but I have seen mention of folks here using MAC OS and Audacity, so I'll ask away... I am able to record using the line input into a 12" powerbook (1GHz / Aluminum / Panther OS) Is there any way to get Audacity to use the onboard sound card's output as a monitor channel? My minimal portable config is often using just a cable from the headphone out of a source and thene there is no monitor available. Thanks in advance for any hints. aloha, dave __________________________________ Do you Yahoo!? Yahoo! Mail - 50x more storage than other providers! http://promotions.yahoo.com/new_mail

20 years, 3 months

[linux-audio-user] Plugzilla LADSPA support

by Dave Phillips

This just in: http://news.harmony-central.com/Newp/2004/Plugzilla-LADPSA.html

20 years, 3 months

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Linux-audio-user September 2004