Linux-audio-dev

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7513 discussions

LV2 control port (parameter) value scaling and mapping?

by Christopher Arndt

Is there a way to have the value range of a control input port of a LV2 plugin be in one range (e.g. 0.0f..1.0f or 0-127) and have the LV2 host display the values scaled or mapped to a different range (e.g. 20-20,000 Hz or 2 - 2000 ms)? I know about lv2:scalePoints and the lv2:enumeration property to handle list of discrete values and the units:unit properties to set the value unit, but how do I map the actual values of a large continuous range? Is there a way to define a transfer function? Or does that need to happen inside the plug-in code? And what about more advanced parameter display, e.g. a wet/dry setting, which I want to display as going from 100:00 through 50:50 to 0:100, but the actual parameter value is just 0.0..1.0 (or -1.0..+1.0)? Background: I'm trying to improve the JX10.ttl from the mda.lv2 collection [1], so that the parameter display in the LV2 host generated plug-in UI is more useful and intuitive, i.e. instead of e.g. the slider for OSC Tuning being going from 0.0 .. 1.0, I want it to be displayed as -24 .. +24 cents. All control input ports of the plugin are defined as taking a value 0.0f..1.0f. [1] http://svn.drobilla.net/lad/trunk/plugins/mda.lv2/ Chris

10 years, 3 months

crosstalk between jack clients/ports?

by Vaclav Mach

Hi, I have the following system based on Jack API already working: /**** single PC configuration *** Jack Connections: system_capture_port->jack_port_in (jack_client_in) jack_port_out (jack_client_out)->system_playback_port process of jack_client_in: jack_port_in buffer->ringbuffer thread1: ringbuffer -> RTP stream process of jack_client_out: ringbuffer->jack_port_out buffer thread2: RTP stream -> ringbuffer *******/ Both of the clients are maintained by the same application. Sound transmission between two PCs is working well, sound is nice, we can talk to each other (something like VoIP). However, a person speaking at PC1 hears his own echo delayed and attenuated. I have found out, that the echo comes from PC2 through the RTP stream (reason of the delay). And now, the most interesting observation is that when I disconnect the Jack connection between jack_port_out and system_playback_port at PC2, the echo at PC1 is no more audible. I want to avoid the echo and I have two ideas where the problem can be: 1) there is a crosstalk between jack ports/clients 2) there is a crosstalk in my HW (mainboard sound device with intel_hda driver) Any advice or suggestion? Thanks, Vaclav

10 years, 3 months

[ANN] Qtractor 0.6.7 - The Lepton Acid beta release!

by Rui Nuno Capela

It's alive! Qtractor 0.6.7 (lepton acid beta) is out! Release highlights: * MIDI instrument rendering on audio export (NEW) * MIDI clip editor view/event criteria persistence (NEW) * MIDI clip editor resilience on record/overdub (FIX) * Generic plugin form position persistence (NEW) * JACK Transport/Timebase master option (NEW) and yet more tiny lurking critters swatted ;) Well, the major highlight to this release is in fact this brand new and way long overdue feature, seamlessly integrated to the faithful and regular audio track export function: MIDI track instrument plug-in rendering and mix-down (aka. freeze) is now real, as long their audio output goes onto selected buses, aka. stems, mix-groups, whatever a mix/mastering head would name it! nb. on the (very esquisite) Qtractor arch-model parlance, those are just called "audio output buses" and that ain't gonna change, any time soon, so stop it! A word of caution must be told by now: dedicated (JACK) audio output ports are off-the-grid, so sorry. Maybe this silently makes a notch towards the DAW epitome, though Qtractor still claims to be just a plain and honest sequencer--with yet another DAW-like feature addition--the same as it ever was. Nuff said. Qtractor [1] is an audio/MIDI multi-track sequencer application written in C++ with the Qt framework [2]. Target platform is Linux, where the Jack Audio Connection Kit (JACK [3]) for audio and the Advanced Linux Sound Architecture (ALSA [4]) for MIDI are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio. Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://download.sourceforge.net/qtractor/qtractor-0.6.7.tar.gz - source package (openSUSE 13.2): http://download.sourceforge.net/qtractor/qtractor-0.6.7-17.rncbc.suse132.sr… - binary packages (openSUSE 13.2): http://download.sourceforge.net/qtractor/qtractor-0.6.7-17.rncbc.suse132.i5… http://download.sourceforge.net/qtractor/qtractor-0.6.7-17.rncbc.suse132.x8… - wiki (help wanted!): http://sourceforge.net/p/qtractor/wiki/ Weblog (upstream support): http://www.rncbc.org License: Qtractor is free, open-source software, distributed under the terms of the GNU General Public License (GPL [5]) version 2 or later. Change-log: - MIDI clip editor (aka. piano-roll) position, size, and view/event type criteria are now persistent, across session and user preferences application state. - Generic plugin form widget position is now also preserved across open/save session cycles. - MIDI clip editor resilience is about to get an improvement, fe. it doesn't close on stopping record/overdub anymore. - Introducing (JACK) Timebase master setting as an option to Transport mode (cf. View/Options.../General/Transport/Timebase). - LV2 plug-in MIDI/Event support now slanted for deprecation. - Spanish (es) translation added, by avid Reyes Pucheta. - It's live: audio track export (cf. Track/Export Tracks/Audio...) has been deeply refactored to finally include MIDI track/instrument plugins rendering (aka. freeze) on selected audio output buses on mix-down. (EXPERIMENTAL) - MIDI file player now does (N)RPN 14-bit controller events. - Track properties dialog output bus switch fix/optimization; also fixed multiple DSSI instance reference count on close. - Fixed for some strict tests for Qt4 vs. Qt5 configure builds. - German (de) translation update (by Guido Scholz, thanks). References: [1] Qtractor - An audio/MIDI multi-track sequencer http://qtractor.sourceforge.net [2] Qt framework, C++ class library and tools for cross-platform application and UI development http://qt.io/ [3] JACK Audio Connection Kit http://jackaudio.org [4] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ [5] GPL - GNU General Public License http://www.gnu.org/copyleft/gpl.html See also: http://www.rncbc.org/drupal/node/894 Enjoy && keep the fun. -- rncbc aka. Rui Nuno Capela

10 years, 3 months

Updated API Reference Manual to 0.4.3-beta of gsequencer

by Joël Krähemann

Hi, me just updated API Reference Manual to 0.4.3-beta of gsequencer. Please visit: http://gsequencer.org/api/ags/index.html cheers, Joël

10 years, 3 months

GuitarSynth now as lv2

by Gerald

Hi, GuitarSynth is now an lv2 plugin. Yep, it's true, thanks to falktx's DPF. You can get it at https://github.com/geraldmwangi/GuitarSynth-DPF. A new feature is the Overlay Input: It multiplies the synth output with the input signal frame by frame. Basically this results in the convolution of the frequency spectrum of the synth with that of the input. Have fun testing it and give me your thoughts. this was announced previously under the subject Jimson Drifts double attack. I guess no one looked at it since the subject says nothing. Sorry for that. Regards, Gerald

10 years, 3 months

New Music

by Gerald

Hi Guys, We've got a new Song, Sailing Sister. Check it out: www.jimson-drift.de under Songs. If your in the Rhein-Neckar area in June, we've got an upcomming gig on June the 18th at the Kulturfenster in Heidelberg (www.kulturfenster.de) this was announced previously under the subject Jimson Drifts double attack. I guess no one looked at it since the subject says nothing. Sorry for that. Regards, Gerald

10 years, 3 months

Mackie Control Display (mcpdisp) 0.0.2 released

by Len Ovens

I did all the things I should have done the first time :) mcpdisp (0.0.2) * Added fflush so we don't use repeating prinfs to flush * Added command to park cursor in lower right corner * Hide cursor! * Set application to start in the lower right screen corner * Control C now exits gracefully * Added changelog * Window close (X) closes jack port properly mcpdisp (0.0.1) * Initial release No, control Q or W do not quit. I have set up no keyboard input at all and won't in this state. TODO: - Rewrite with a GUI tool kit instead of using a terminal. - Allow stretching the window to match channels to control surface. - Use nicer colours. -- Len Ovens www.ovenwerks.net

10 years, 4 months

Lv2ui support for GSequencer

by Joël Krähemann

Hi all, check out lv2ui support for gsequencer, it still unstable and not tested, yet. https://github.com/weedlight/ags-devel For any suggestions me would benefit. Next days me improves thread reliability and safety ... Let me know if you want to contribute and please take a look at: https://github.com/weedlight/ags-devel/issues There was a big refactoring going on and the birth of Advanced Gtk+ Sequencer libraries, namely * libags * ibags-thread * libags-audio * libags-gui For sure don't forget the application `gsequencer`. http://gsequencer.org Cheers, Joël Krähemann

10 years, 4 months

Re: [LAD] [LAU] Jimson Drifts double attack ;)

by Gerald

Hi, F. Silvain Critisism is always welcome, thanks. The drummer and I (guitar) know we can be off tempo. Thats why we rehearse/record/play live always with metronom in the ear. Imagine that, otherwise it would be worse ;) Needless to say the bassist has a builtin metronom, he doesn't need the click in the ear. Once we challenged him: We told him to clap a tempo, say 105 bpm. He first started clapping, then I turned on the metronom at 105 bpm and he was perfectly in sync with it. Same at 85, 97 and 128 bpm! Crazy. I forbid him to move away after his studies and til now he's obedient :) As for the sounds, we purposely mix sounds and genres together but it somehow always boils down to rock stuff :(. At sometime I'll put the guitar aside for some songs and only do electro sounds, or wait: When GuitarSynth is there where I want it (polyphony) the rock will go, the electro will come ... Gerald On 14.05.2015 23:44, F. Silvain wrote: > I have some bad points as well. You drummer sounds a little off. The > guitar sometimes too, though that might be by design. With the drummer > it's really noticeable. Also the production of the drums sounds > typically "free music". You've kept the sound of the drums as they > probably were, really nice, but in this productions my ears tell me, > that it's too much. Even with just bass and guitar. For jazz it would > have felt nice, but not for this rocky genre. The guitar sound itself > was very agreeable though. > > Thank you for sharing and please don't take my comments as senseless > complaints.

10 years, 4 months

Jimson Drifts double attack ;)

by Gerald

Hi Guys, I've got a double announcement to make: First one: We've got a new Song, Sailing Sister. Check it out: www.jimson-drift.de under Songs. If your in the Rhein-Neckar area in June, we've got an upcomming gig on June the 18th at the Kulturfenster in Heidelberg (www.kulturfenster.de) Second one: GuitarSynth is now an lv2 plugin. Yep, it's true, thanks to falktx's DPF. You can get it at https://github.com/geraldmwangi/GuitarSynth-DPF. Have fun testing it and give me your thoughts. Cheers Gerald

10 years, 4 months

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Linux-audio-dev