Linux-audio-dev

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7441 discussions

Re: [linux-audio-dev] Documentation of the PADsynth synthesis algorithm

by Kjetil S. Matheussen

Paul: > Hi. > I am Paul, the author of ZynAddSubFX software > synthesizer. > I wrote a complete documentation of how the PADsynth > synthesis algorithm works. It includes the full > description of the algorithm: overview, text > description, diagrams, pseudocode; example C/C++ > implementations and a ready-to-use C++ class. > > Also, I included some audio examples into the page. > Please tell me your opinion about it. Wow, this is great work! Especially this one is so impressive: http://zynaddsubfx.sourceforge.net/doc/PADsynth/demos/0km.ogg --

18 years, 11 months

[linux-audio-dev] file format

by fons adriaensen

Hi all, For one of my current projects (to be presented at LAC2006) I'm looking for a suitable file format. Each file should contain: - A number of short (+/- 10 seconds) chunks of PCM audio. The number of channels will be different in each chunk. The only sample format required is single precision floating point. For multi-channel chunks, non-interleaved is preferred. All chunks will normally use the same sample frequency. - Metadata, both numerical and textual. The format should allow to have several chunks of these, and to add new ones later without breaking compatibility (i.e. readers will ignore parts they do not understand). There is no need for the audio to be usable with normal players - it's not meant to be listened to directly. Is there any standard file/container format that would provide for this sort of thing ? I've been looking at ogg, but it's a bit over the top - I don't need any streaming features. The alternative is of course to have separate WAV files and some text file for the metadata, and combine all of this into a directory that would then be handled as a unit. But I'd prefer to have all data in a single file. -- FA

18 years, 11 months

[linux-audio-dev] Help on csound real time front end project?

by Iain Duncan

Wondering if anyone on hear is interested in working with me on my c/c++ front end for real time improvisation using csound5 as the audio engine. The concept in a nutshell is like a cross between say Doepfer step sequencers ( or Softwerk ) and Ableton live, except multi user and designed for speed and improvisation and a more musician oriented way of thinking. Proof of concept has been done and used on gigs, now it is time to do it properly in C/C++. I think my c/c++/fltk/midi/csound api chops are up to the point now of making a usable framework that will be useable for a serious sequencer, but I am definitely more of a designer then experieced coder, so it would be great to collaborate. if there is interest I can start a list and site for this. Feel free to contact me here or off list. Thanks Iain

18 years, 11 months

[linux-audio-dev] Re: [linux-audio-user] Smack 0.2 released.

by federico

federico ha scritto: > Loki Davison ha scritto: > >> Hi all, >> Smack 0.2 is now out. Smack is a drum synth, 100% sample free. It's >> built with LADSPA plugins and the Om modular synth. New in this >> release are Noise and resonate filter based metallic percussion, ring >> modulation based drums, velocity sensitivity, control ports for all >> drums and random other goodness. Get it at http://smack.berlios.de/ >> There are also some new sound demos on the site including a physical >> modeling based djembe. The gui is no longer included due to huge >> improvements with om_gtk, and lack of time for maintaining it. Please >> just use om_gtk or the emacs bindings. >> >> Cheers, >> Loki >> >> >> >> > i got this error trying to load some of your patches: > > ERROR: Unable to make connection > /808kit/808hihat/midi_trigger_in0/Gate -> > /808kit/808hihat/adenv_lvl_0/Reset Level > ERROR: Unable to make connection > /808kit/808hihat/midi_trigger_in1/Gate -> > /808kit/808hihat/adenv_lvl_1/Reset Level > ERROR: Unable to make connection /808kit/808hihat/OH gate/in -> > /808kit/808hihat/adenv_lvl_0/Reset Level > ERROR: Unable to make connection /808kit/808hihat/CH gate/in -> > /808kit/808hihat/adenv_lvl_1/Reset Level > ERROR: Unable to make connection /909bass/midi_trigger_in0/Trigger -> > /909bass/adenv_lvl_0/Reset Level > ok i solved the errors above by installing omins-cvs. but still hear no sound. i lift up all volume slider, twiddled with sliders, checked that all the output are connected to a soundcard output, and checked that for midi connections too. there aren't any error message in the om console and in the om_gtk console, except (om_gtk:21016): Gtk-CRITICAL **: gtk_range_set_range: assertion `min < max' failed, but everything seems to work fine, except for the audio :| > i see the audio outputs and the alsa input (triggers), i send midi > notes to them, but it doesn't output any sound. > > can you help me? >

18 years, 11 months

[linux-audio-dev] [ANN] DSSI 0.9.1 release

by Sean Bolton

Announcing the DSSI Soft Synth Interface version 0.9.1 release: http://dssi.sourceforge.net/ DSSI is an audio plugin API for software instruments and effects, based on LADSPA, the ALSA sequencer event types, and OSC (Open Sound Control) communications. This release does _not_ contain any changes to the DSSI API itself, which has been stable now since the 0.4 release fifteen months ago (with minor additions at 0.9). Instead, it contains numerous clarifications to the specification and documentation, and the included reference host and example programs have become significantly more robust. Specific changes in 0.9.1 include: - The distribution now has a full autoconf/automake/libtool build system. - FluidSynth-DSSI has been moved into its own package, and no longer depends upon the FluidSynth source. - The reference host, jack-dssi-host, now supports plugins with audio inputs, as well as LADSPA-only plugins (with or without custom DSSI GUIs.) Available hosts and plugins --------------------------- More exciting than the changes in this release, is the recent growth in DSSI implementations. Items marked with '*' are new since the DSSI 0.9 release. Available hosts are: - jack-dssi-host, included in the DSSI distribution - the Rosegarden 4 sequencer * Om, a modular synthesizer * ghostess, a lightweight GTK+ host * dssi~, a Pure Data external Efforts are underway to add DSSI hosting to: - the MusE sequencer * Csound5 * GNU Classpath Available plugins include: - the simple synths and sampler in the DSSI distribution - FluidSynth-DSSI, a soundfont-playing plugin - Xsynth-DSSI, an analog-style synth - dssi-vst, a wrapper plugin enabling the use of many Windows VST plugins - hexter, a Yamaha DX7 modeling plugin * ll-scope, an oscilliscope plugin * Sineshaper, a waveshaping soft synth * dssi_convolve, a DSSI wrapper around libconvolve * xy-controller-dssi, a GUI controller plugin which translates mouse input into X-Y control outputs * WhySynth, which offers a number of synthesis methods The Future ---------- In the year and a half since its initial introduction, DSSI has met a number of challenges to its adoption: the continued (perpetual?) forthcomingness of GMPI, apprehension about adopting a standard with 'Disposable' in its name, some "wait and see if takes off" attitude, and numerous gripes that it won't do this or can't do that. Even so, the creative potential available through DSSI today is great. In part due to this success, there has been a noticable commitment voiced in recent discussions on the DSSI email list to keeping any future enhancements backward-compatible with the existing DSSI API. In the author's opinion, this indicates DSSI will continue to be a stable API, at least until such time as a '2.0' version is considered. With regard to possible future enhancements, interest has been highest in two areas: providing plugins with transport position and tempo information, and allowing plugins to send MIDI data. If you're interested in helping shape these or other developments, please join us on the DSSI discussion list.

18 years, 11 months

[linux-audio-dev] snd-usb-usx2y on amd64?

by Arnold Krille

Hi all, sorry for cross-posting. I just wanted to know wether there are any known problems with the snd-usb-usx2y on amd64? 'Cause I got such a laptop now and experience some trouble with my tascam. :-( If I use it at non-realtime and high-realtime is works (at least for the first start of jackd) but realtime and/or low-latency just freezes the system. Maybe there is something I can do to increase the verbosity of the driver while crashing? The data of my machine: kernel is gentoo-2.6.13-r2 with the bundled alsa-1.0.9b, the usb-driver is ohci-hcd. The machine is a turion64 and I have acpi turned on... Thanks in advance, Arnold -- visit http://dillenburg.dyndns.org/~arnold/ --- Wenn man mit Raubkopien Bands wie Brosis oder Britney Spears wirklich verhindern könnte, würde ich mir noch heute einen Stapel Brenner und einen Sack Rohlinge kaufen.

18 years, 11 months

[linux-audio-dev] Smack 0.2 released.

by Loki Davison

Hi all, Smack 0.2 is now out. Smack is a drum synth, 100% sample free. It's built with LADSPA plugins and the Om modular synth. New in this release are Noise and resonate filter based metallic percussion, ring modulation based drums, velocity sensitivity, control ports for all drums and random other goodness. Get it at http://smack.berlios.de/ There are also some new sound demos on the site including a physical modeling based djembe. The gui is no longer included due to huge improvements with om_gtk, and lack of time for maintaining it. Please just use om_gtk or the emacs bindings. Cheers, Loki

18 years, 11 months

[linux-audio-dev] envy24control

by Mike Fisher

When I try to compile the envy24control package I get the following during configure. checking for ALSA CFLAGS... checking for ALSA LDFLAGS... -lasound checking for libasound headers version >= 0.5.5... found. checking for snd_cards in -lasound... no configure: error: No linkable libasound was found. using gcc 3.3.6 Now, I'm not exactly sure what libasound does, but I do know that ardour, jack, and other alsa programs work for me with no problems. Any kind of help would be good. I'm still learning linux here so sorry guys. -Mike Fisher __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com

18 years, 11 months

[linux-audio-dev] MVC - multiple CV

by fons adriaensen

Hi all, working on the strict MVC-fication of Aeolus (a precondition for its OSC-fication), I'm again confronted with a problem that has been discussed a number of times on this list. It has been stated that the model should send updates to all clients except the one that originated a parameter change. While this will work if all communication is synchronous, it will go wrong easily when there are delays, e.g. over a network. Imagine an M and to CV clients, A and B. There are two transmission paths: A -> M -> B, and B- > M -> A. If the two ever intersect in time, the originator of the final value used by M will end up displaying the other one. So the only solution seems to echo parameter updates to all clients, including the one that requested them. In that way (and assuming messages remain in order), all clients will have the value used by M. If messages do not remain in order, the solution is to have a serial number set by M on each update and included in all messages. Finally, if the communication is unreliable as well, M should broadcast periodic updates of its state, or at least of those parts that have recently changed. Of course this may create some problems, e.g. when a GUI client's slider is being dragged, and it receives 'old' update values while this is happening. The solution seems to be simple: while dragging, ignore all updates but keep the most recent one. Execute this one when the slider is released. It may be a good idea to extend the 'ignore state' by a small time (e.g. 0.1 s) after release. Another approach would be have an originating client id in each message, and some mark to indicate the final request (upon release). Then, while dragging, ignore other clients, and always only act on marked messages from yourself. Anyone having any experience with this ? -- FA

18 years, 11 months

[linux-audio-dev] New RSS feed for Linux Audio Announce

by Olivier Guilyardi

Hi, I have set up an RSS feed for Linux Audio Announce : http://www.samalyse.com/rss/laa.rss It is updated every hour. For example, it is useful to display news and links about other Linux audio software on a webpage. That's what I currently do on Jackbeat's homepage : http://www.samalyse.com/jackbeat I mean : it can act as a sort of ring, a way to link to each other. If you are the author of an application, you can put LAA news and links on its homepage, if you like the idea. Enjoy -- og

18 years, 11 months

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