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[linux-audio-dev] [ANN] TAP-plugins 0.6.0 +more

by Tom Szilagyi

TAP-plugins 0.6.0 released. TAP Reverb Editor initially released. Homepage: http://tap-plugins.sf.net OK, here we go: * New plugin: TAP Fractal Doubler. Suitable for doubling tracks containing vocals, acoustic/electric guitars, bass and just about any other instrument. The effect is created by applying small changes to the pitch and timing of the incoming signal. The changes are created by a one-dimensional random fractal line producing pink noise. Special thanks to Jan Depner for suggesting this plugin and pointing me to useful information about fractals. * New plugin: TAP Reflector. This plugin creates a psychedelic reverse audio effect. It is especially worth trying this plugin on sustained guitar and vocal tracks. Percussive sounds also create a very characteristic atmosphere when played in a backward-ish style. * New plugin: TAP Pink/Fractal Noise. This plugin came to life as a secondary product of the development of TAP Fractal Doubler. It generates pink noise by means of a one-dimensional random fractal line generated by the midpoint displacement method. Yes, it's Reverb time again! * Vastly enhanced the internal workings of TAP Reverberator. As a result, the sonic quality of reverberation got much better. (Well, at least, now it *IS* real reverberation.) If you tried it once, and found it sounded like hell, you definitely need to check it out now! * Long-long-standing denormal float (or whatever) problems causing occasional runaway CPU-usage led to the complete re-implementation of the internal DSP algorithm of the reverb using fixed-point arithmetics. This inherently fixes denormal problems. However, the option to use the previous floating-point DSP code remains as a #define which you can set before compiling. The default is to use fixed-point math. Very special thanks to Jan Depner for spending his time with repeatedly testing the reverb and sharing his insights. * A new application named TAP Reverb Editor has been written. It is a standalone JACK app, with a GTK+-2 user interface. It works and sounds the same as the LADSPA version (TAP Reverberator), but has extended features that support direct editing of Reverb Types, with immediate visual and sonic feedback. You can design new Reverb Types easily, and 'backporting' these into the LADSPA version is also a breeze. This program is available as a separate package called TAP-reverbed. * Introducing some new Reverb Types: I made these for some acoustic guitar tracks: * Ambience * Ambience (Thick) * Ambience (Thick) - HD ...and these for fun: * Cathedral * Cathedral - HD Other changes: * TAP Dynamics plugins (both Mono and Stereo) were also affected by a runaway CPU-usage issue. It was fixed in the same way as with the reverb: by converting the internals to use fixed point math by default. (The #define option to use floating point math still remains.) * Applied patch from Luke Yelavich to clean up the Makefile a bit. * Complete website/docs redesign. The documentation for TAP-plugins and the user manual for TAP Reverb Editor is now available for download as a separate package called TAP-plugins-doc. Hope you enjoy this release. Please report any problems. Tom

21 years, 4 months

[linux-audio-dev] Audio over Ethernet / Livewire

by Frank van de Pol

While surfing the web I came across an interesting paper regarding Audio over Ethernet in low-latency low-jitter professional studio environments. I don't know to what extent the proposed scheme is open or patented or whatsoever. http://www.telos-systems.com/techtalk/ethernet4audio/NAB03_CHURCH_FINAL_2.p… Have fun, Frank. -- +---- --- -- - - - - | Frank van de Pol -o) A-L-S-A | FvdPol(a)coil.demon.nl /\\ Sounds good! | http://www.alsa-project.org _\_v | Linux - Why use Windows if we have doors available?

21 years, 4 months

[linux-audio-dev] Linux soundapps site: European mirror updated (really)

by Dave Phillips

Greetings: The Linux soundapps site is now mirrored in Europe at the following URL : http://linuxsound.atnet.at Please update your bookmarks. The www.linuxsound.at URL is no longer in use. The hosting site contacted me regarding the outdated material that was still displayed, and I have brought the site into sync with the US and Japanese mirrors. This time for sure... Best regards, Dave Phillips

21 years, 4 months

[linux-audio-dev] Spinboxes

by Thorsten Wilms

Hi! The usual spinboxes with their tiny up/down arrow buttons made me think about an alternative. Since using more height than a textfield has would make layout very troublesome, my solution is placing the buttons horizontaly. http://wrstud.urz.uni-wuppertal.de/~ka0394/forum/04-06-20_spinbox_set_02.png I think the variations with arrows are less pleasant to look at. Using - and + also avoids confusion with option menus. But I would like to hear everyone's opinion on that. I don't know if showing the value as bar in the background is a good idea in the end, because it might be confusing (?) The right ones show highlighting (and the usual cursor change) on mouse-over. Mousewheel should work on mouse-over (no clicking required) just like is the case with GTK+ spinboxes (can't test other toolkits now). The minus key should be reserved for entering the minus sign. Middle mouse button should be reserved for paste, right one for context menu (besides copy/paste it could contain max, min and 50% commands). So only clicks with modifier keys are left. I would propose Ctrl leftclick on -/+ buttons for larger steps. --- Thorsten Wilms

21 years, 4 months

[linux-audio-dev] davis is a doofus head

by Paul Davis

forget all that ranting i made about jack_frames_since_cycle_start(). jack_frame_time() is an interpolated function that can be safely called from any thread (its not RT-safe, but it is fast), and will return a monotonically increasing frame counter. i wrote it. --p

21 years, 4 months

[linux-audio-dev] [jack] frame_time of first frame in proces buffer?

by Florian Schmidt

I wonder how to find out which frame_time corresponds to the first frame in the buffer passed to the process callback.. Is it possible at all? does jack use an internal frame counter which corresponds to jack_frame_time? Thanks Florian Schmidt -- Palimm Palimm!

21 years, 4 months

[linux-audio-dev] Re: lock-free data structures

by Juhana Sadeharju

>From: Tim Hockin <thockin(a)hockin.org> > >> Quick question: disk thread may suspend if there are no disk use. >> How the disk thread is woken up to read the lock-free buffer? > >Semaphore. Every time you put something into the buffer, up() the So, one thread for RT-audio, one thread to watch and suspend on semaphores, and one thread to select() on FDs (for communication from the application and from the semaphore watcher). Which one is better? (1) RT-audio thread ---> pipe ---> select() thread (2) RT-audio thread ---> semaphore --> semaphore watcher thread --> pipe --> select() thread Of course, better for RT-audio thread. While the case (2) is more complex, it could be better for RT-audio thread. How this all is done in Ardour? I browsed the source but there are a lot of stuff there. How about LinuxSampler? Juhana

21 years, 4 months

[linux-audio-dev] [ANN] Specimen 0.4.0 "Smooth"

by Pete Bessman

Specimen is a MIDI controllable SoftSampler for GNU/Linux systems. Features added since 0.3.0 include: * Portamento * Per-parameter LFOs with delay and attack * LFOs may be "global" (voice independent) or per-voice * LFOs may be constrained to oscillate between 0 and 1 instead of -1 and 1 * ADSRs have gained delay and hold phases * Most parameters can be velocity sensitive to a user-specified degree * LFO/ADSR amounts for pitch are now entered in half-steps * A sample's pitch may be adjusted within a user-definable range You can download the latest tarball (some assembly requried) from www.gazuga.net, or directly below: http://www.gazuga.net/files/specimen-0.4.0.tar.gz The focus of the 0.4.x series is the GUI, so if you've got a gripe or a wish about that, now's the time to pipe up. As always, my inbox is wide open to suggestions and bug reports. -Pete

21 years, 4 months

[linux-audio-dev] pitch-shift library

by Florin Andrei

Anyone knows a library (or an algorithm or something) for CPU efficient pitch-shifting? Essentially, i want to take arbitrary audio input and pitch shift it just a little bit, indeed very little - the shift should be so small as it would not even qualify as out-of-tune for most practical purposes (provided that the original sound is perfectly in-tune). A shift not bigger than the usual tuning error of ordinary unplugged instruments. I also need to vary the shift, not too fast (the pitch shifting modulator will change the shift up and down a couple times per second or less), but still change it dynamically. The algorythm should be efficient enough to allow real-time processing of at least 16 sound channels simultaneously, and still leave some CPU power untouched. All this should be incorporated into a LADSPA plugin that i plan to build (and it's only a part of the functionality). -- Florin Andrei http://florin.myip.org/

21 years, 4 months

[linux-audio-dev] [ANN] New releases of Aeolus and Jaaa

by Fons Adriaensen

New releases of Aeolus and Jaaa are now available at <http://users.skynet.be/solaris/linuxaudio> Aeolus-0.2.0 ------------ - bugfixes, - some new stops, - added tuning and temperament controls, - added controls for tremulant speed and intensity. Still no manual :-( but it's coming... This will be a stable release for some time. The next major step is to add the 'chiff' generators, and this will require a lot a research and work. First step is to make recordings of real pipes and analyse them to find the noise spectra. I'll probably be making recordings of the Metzler organ in the Antwerp cathedral during the coming months. Then it's back to the drawing board. The target is to make this work for LADconf 3... Jaaa-0.1.0 ---------- Some bugfixes, no new features. Adapted to the new shared libs, see below. There's a minimal manual in the README. Shared libraries ---------------- libalsadrv.so used by earlier releases is replaced by clalsadrv-0.0.1, libclthreads and libclxclient have been are upgraded to 0.0.2. Please delete all earlier versions of these libs, they are now useless. The so-names are now correct, and Aeolus and Jaaa will link with the *.so.0 files. I had this completely wrong in the first release (thanks to Fernando for complaining about this :-). -- Fons

21 years, 4 months

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Linux-audio-dev