Linux-audio-user July 2011

linux-audio-user@lists.linuxaudio.org

103 participants
107 discussions

Steinway_IMIS2.2 soundfont (no loops fix)

by Roberto Gordo Saez

This is Steinway_IMIS soundfont, version 2.2. ftp://musix.ourproject.org/pub/musix/sf2/Steinway_IMIS2.2 This version fixes the issue with loops. I hope this is the good one and there are no more remaining major bugs. Marcos is a little busy right now, so he asked me to make this fix. He is thinking to make other improvements, so expect more updates soon.

1 year, 7 months

[linux-audio-user] Sub-harmonic generator? (LADSPA or VST)

by Tim Howard

Hello, Does anyone know of a good plugin that will generate subharmonics? I would like to put a little more low frequency "oomph" into my bass track. Preferrable LADSPA, but VST would work, too. Thanks for any help! -TimH

8 years, 2 months

Alternative FluidSynth GUI?

by Dan Capp

Research tells me that QSynth seems to be the only currently available/usable GUI for FluidSynth, but I get big xruns whenever I try and use it. FluidSynth itself doesn't cause me problems (I know because I'm able to use the FluidSynth-DSSI plugin fine in Rosegarden etc). The problem is that I want to use FluidSynth with Ardour3, but Ardour3 doesn't support DSSI plugins yet. So the only solution I have is to find a standalone interface for FluidSynth and then to link up using Jack. I looked at the old GUI 'FluidGUI' but it seems to be so old that it won't properly install on recent versions of Ubuntu. So does anyone know of: 1) A GUI for FluidSynth other than QSynth and FluidGUI?... or 2) An application other than the above 2 which would allow me to load soundfonts? Thanks in advance. - Dan

8 years, 11 months

[ANN] KMidimon 0.7.4 released

by Pedro Lopez-Cabanillas

KMidimon is a MIDI monitor for Linux using ALSA sequencer and KDE4 user interface. Changes in 0.7.4 * requires Drumstick >= 0.5 * load and play OVE files (Overture), contributed by Rui Fan * option to request real-time priority on MIDI input thread * option to (not) resize columns while recording * better reporting of file loading errors * revised universal sysex messages translation Copyright (C) 2005-2010, Pedro Lopez-Cabanillas License: GPL v2 More info http://kmidimon.sourceforge.net Sources http://sourceforge.net/projects/kmidimon/files/ Regards, Pedro

11 years, 3 months

[alsa] pci device ordering

by Tim Blechmann

hi all, (posted the same message on the alsa-user list, but without reply, now trying here) i have a machine with two pci devices of the same type. how can i ensure persistent device indices? the wiki [1] mentions a way for a way using vid/pid, but for pci devices it suggests to write a udev rule. [2] has an example, but it only describes how to set up the device names in /dev/snd. but how do i bind a specific device to an alsa device index (hw:X)? thanks, tim [1] http://alsa.opensrc.org/MultipleCards#How_to_choose_a_particular_order_for_… [2] http://alsa.opensrc.org/Udev

12 years, 3 months

linuxsampler on 64 bit Ubuntu

by Robin Paulson

i recently built a 64 bit Ubuntu studio machine, and am looking for 64 bit packages - the Linux sampler home page only has 32 bit though. does anyone know where i might find a package, compiled either for Ubuntu or Debian? cheers -- robin http://bumblepuppy.org/blog/?p=237 - government bill to remove basic human rights in NZ

12 years, 8 months

Re: [LAU] Simple, easy multithreaded circular buffer library for Linux?

by Kjetil S. Matheussen

Olivier Guilyardi: > > Ken Restivo wrote: >> It has been over 7 years since I last messed around with writing Pthreads applications. >> >> I recall it as a painful, ugly, brain-numbing task. I located an exercise I did back then to address the consumer/producer problem in Pthreads, and just the sight of it is giving me a headache. >> >> I'm being lazy, so instead of researching everything that's out there, I'll ask here: can anyone recommend a relatively simple and painless abstraction library (GPL or LGPL of course) that will give me functions to create a thread in which I can stuff things into a ring buffer, and another thread in which I can pull stuff out of it? >> >> By the way, I know that JACK has a very nice event buffer which is insanely easy to use (and I have), and makes multithreading almost transparent, but this isn't a JACK app. > > I don't know of any abstraction library, but creating/terminating a normal > thread with pthread is really an easy task IMO. It's about 10 lines in C. > > For inter-thread communication there's Portaudio's ring buffer: > http://portaudio.com/trac/browser/portaudio/trunk/src/common/pa_ringbuffer.h > > It can easily be used out of Portaudio (I'm currently doing that), and it > features memory barriers [1] which AFAIK Jack's ringbuffer doesn't. > > One problem with everything Portaudio is this heavy naming scheme. For a simpler > API, you might like my little wrapper: > http://jackbeat.samalyse.org/browser/jackbeat/trunk/src/core/ringbuffer.h > Nice. It's probably quicker to copy the jack_ringbuffer.c file out of jack though. > Portaudio actually also offers a callback mechanism (with hidden thread > creation), so if you're coding an non-JACK audio app, you might want to check it > out. > > For thread synchronization, semaphores (man semaphore.h) are really easy to use. > However, if you need a lock-free equivalent (for realtime, ...) phtread mutex > and especially pthread_mutex_trylock are your friends. > Those friends can be really cranky sometimes though. By using atomic operations instead, it's possible to avoid a lot of headache by not having to synchronize at all. Performance might be better too. Midishare has lockfree atomic functions for lifo and fifi queues: http://midishare.cvs.sourceforge.net/viewvc/midishare/midishare/src/common/…

12 years, 10 months

pulseaudio in realtime mode

by Emanuel Rumpf

I can't start pulseaudio in realtime mode: I: module-jack-sink.c: JACK buffer size changed. I: module-jack-sink.c: JACK thread starting up. I: core-util.c: Successfully enabled SCHED_RR scheduling for thread, with priority 9. I: core-util.c: Successfully enabled SCHED_RR scheduling for thread, with priority 13. W: module-jack-sink.c: JACK error >Cannot use real-time scheduling (RR/67)(1: Operation not permited)< W: module-jack-sink.c: JACK error >JackClient::AcquireSelfRealTime error< But /etc/secuity/limits.conf @audio - rtprio 99 @audio - nice -20 @audio - memlock 6000000 @pulse-rt - rtprio 99 @pulse-rt - nice -20 @pulse-rt - memlock 6000000 groups user user dialout cdrom audio plugdev lpadmin pulse admin sambashare pulse-rt -- E.R.

12 years, 10 months

Some heavy stuff and some weird stuff made with linux

by Arve Barsnes

Probably not the greatest display of what you can do with a linux box this, but we just released two albums and an ep yesterday. The albums are grindcore of the short variety (both albums are 19 songs in just above 2 minutes), but the ep (The Piece.....) is a simple acoustic song in 5/4 with some weird stuff on top. Even managed to use zita-at1 in there. It'll only take you 7 minutes to listen to all the three releases, so take a listen to the band that only exists because we thought it was funny that noone had ever used this word in a bandname before ;p http://constipation.bandcamp.com Regards, Arve

12 years, 11 months

Recommended USB interface with 2 XLR inputs?

by Mark Knecht

I apologize for cross posting. I asked this on Alsa-Users a couple of days ago but haven't received any responses. As it's about shopping I might do this weekend I figured I'd try here also. Thanks in advance. I'd like to pick up something to do simple mobile recording gigs with my laptop. It needs to be USB 2.0 based, have 2 XLR inputs, support headphone monitoring and preferably do 96KHz. The M-audio Fast Track Pro seems to come closest although as I understand it that device won't do 96K on all inputs and outputs at the same time. Not a huge deal but one tick against for that. What other devices do folks suggest I take a look at? Thanks, Mark

13 years, 1 month

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Linux-audio-user July 2011