Linux-audio-user January 2014

linux-audio-user@lists.linuxaudio.org

112 participants
95 discussions

Use of 96 kHz sample rate to lower latency

by Joel Roth

Happy New Year all, I was curious, if doubling the sample rate is a practical way to reduce latency for live effects processing. I would think it would reduce latency by half. If one wanted to avoid the tradeoff of handling twice the usual amount of audio data, I was curious if ALSA sample rate conversion, or some other clever hack could be used to get low latency advantage of the high sample rate, while actually dealing with 48k streams through JACK. best wishes, Joel -- Joel Roth

11 years, 11 months

[ANN] A fifth of a Jubilee with a late Mike November release

by Rui Nuno Capela

(attn: this corrects wrong urls from the previous announcement which should be now ignored) -- Happy New Year to y'all. Not a fiscal report I'm afraid but the biggest load of Q-stuff released ever ;) Enjoy! * QjackCtl - A JACK Audio Connection Kit Qt GUI Interface * QjackCtl 0.3.11 is out! QjackCtl is a simple Qt application to control the JACK sound server, for the Linux Audio infrastructure. website: http://qjackctl.sourceforge.net downloads: http://sourceforge.net/projects/qjackctl/files - source tarball: http://downloads.sourceforge.net/qjackctl/qjackctl-0.3.11.tar.gz - source package: http://downloads.sourceforge.net/qjackctl/qjackctl-0.3.11-20.rncbc.suse131.… - binary packages: http://downloads.sourceforge.net/qjackctl/qjackctl-0.3.11-20.rncbc.suse131.… http://downloads.sourceforge.net/qjackctl/qjackctl-0.3.11-20.rncbc.suse131.… * Qsynth - A FluidSynth Qt GUI Interface * Qsynth 0.3.8 is out. Qsynth is a FluidSynth GUI front-end application written in C++ around the Qt4 toolkit using Qt Designer. website: http://qsynth.sourceforge.net downloads: http://sourceforge.net/projects/qsynth/files - source tarball: http://downloads.sourceforge.net/qsynth/qsynth-0.3.8.tar.gz - source package: http://downloads.sourceforge.net/qsynth/qsynth-0.3.8-4.rncbc.suse131.src.rpm - binary packages: http://downloads.sourceforge.net/qsynth/qsynth-0.3.8-4.rncbc.suse131.i586.r… http://downloads.sourceforge.net/qsynth/qsynth-0.3.8-4.rncbc.suse131.x86_84… * Qsampler - A fluidsynth Qt GUI Interface * Qsampler 0.2.3 is (finally) out! Qsampler is a LinuxSampler GUI front-end application written in C++ around the Qt4 toolkit using Qt Designer. website: http://qsampler.sourceforge.net downloads: http://sourceforge.net/projects/qsampler/files - source tarball: http://downloads.sourceforge.net/qsampler/qsampler-0.2.3.tar.gz - source package: http://downloads.sourceforge.net/qsampler/qsampler-0.2.3-6.rncbc.suse131.sr… - binary packages: http://downloads.sourceforge.net/qsampler/qsampler-0.2.3-6.rncbc.suse131.i5… http://downloads.sourceforge.net/qsampler/qsampler-0.2.3-6.rncbc.suse131.x8… * QXGEdit - A Qt XG Editor * QXGEdit 0.1.2 is out! QXGEdit is a Qt GUI for editing MIDI System Exclusive files for XG devices (eg. Yamaha DB50XG). website: http://qxgedit.sourceforge.net downloads: http://sourceforge.net/projects/qxgedit/files - source tarball: http://downloads.sourceforge.net/qxgedit/qxgedit-0.1.2.tar.gz - source package: http://downloads.sourceforge.net/qxgedit/qxgedit-0.1.2-2.rncbc.suse131.src.… - binary packages: http://downloads.sourceforge.net/qxgedit/qxgedit-0.1.2-2.rncbc.suse131.i586… http://downloads.sourceforge.net/qxgedit/qxgedit-0.1.2-2.rncbc.suse131.x86_… * QmidiCtl - A MIDI Remote Controller via UDP/IP Multicast * QmidiCtl 0.1.1 is out! QmidiCtl is a MIDI remote controller application that sends MIDI data over the network, using UDP/IP multicast. Inspired by multimidicast and designed to be compatible with ipMIDI for Windows. website: http://qmidictl.sourceforge.net downloads: http://sourceforge.net/projects/qmidictl/files - source tarball: http://downloads.sourceforge.net/qmidictl/qmidictl-0.1.1.tar.gz - source package: http://downloads.sourceforge.net/qmidictl/qmidictl-0.1.1-2.rncbc.suse131.sr… - binary packages: http://downloads.sourceforge.net/qmidictl/qmidictl-0.1.1-2.rncbc.suse131.i5… http://downloads.sourceforge.net/qmidictl/qmidictl-0.1.1-2.rncbc.suse131.x8… * QmidiNet - A MIDI Network Gateway via UDP/IP Multicast * QmidiNet 0.1.3 is out! QmidiNet is a MIDI network gateway application that sends and receives MIDI data (ALSA MIDI Sequencer and/or JACK MIDI) over the network, using UDP/IP multicast. Inspired by multimidicast and designed to be compatible with ipMIDI for Windows. website: http://qmidinet.sourceforge.net downloads: http://sourceforge.net/projects/qmidinet/files - source tarball: http://downloads.sourceforge.net/qmidinet/qmidinet-0.1.3.tar.gz - source package: http://downloads.sourceforge.net/qmidinet/qmidinet-0.1.3-2.rncbc.suse131.sr… - binary packages: http://downloads.sourceforge.net/qmidinet/qmidinet-0.1.3-2.rncbc.suse131.i5… http://downloads.sourceforge.net/qmidinet/qmidinet-0.1.3-2.rncbc.suse131.x8… the Vee One Suite gets another bump, * synthv1 - an old-school polyphonic synthesizer * synthv1 0.3.6 is out! synthv1 is an old-school all-digital 4-oscillator subtractive polyphonic synthesizer with stereo fx. LV2 URI: http://synthv1.sourceforge.net/lv2 website: http://synthv1.sourceforge.net downloads: http://sourceforge.net/projects/synthv1/files - source tarball: http://downloads.sourceforge.net/synthv1/synthv1-0.3.6.tar.gz - source package: http://downloads.sourceforge.net/synthv1/synthv1-0.3.6-13.rncbc.suse131.src… - binary packages: http://downloads.sourceforge.net/synthv1/synthv1-0.3.6-13.rncbc.suse131.i58… http://downloads.sourceforge.net/synthv1/synthv1-0.3.6-13.rncbc.suse131.x86… * samplv1 - an old-school polyphonic sampler * samplv1 0.3.6 is out! samplv1 is an old-school polyphonic sampler synthesizer with stereo fx. LV2 URI: http://samplv1.sourceforge.net/lv2 website: http://samplv1.sourceforge.net downloads: http://sourceforge.net/projects/samplv1/files - source tarball: http://downloads.sourceforge.net/samplv1/samplv1-0.3.6.tar.gz - source package: http://downloads.sourceforge.net/samplv1/samplv1-0.3.6-13.rncbc.suse131.src… - binary packages: http://downloads.sourceforge.net/samplv1/samplv1-0.3.6-13.rncbc.suse131.i58… http://downloads.sourceforge.net/samplv1/samplv1-0.3.6-13.rncbc.suse131.x86… * drumkv1 - an old-school drum-kit sampler * drumkv1 0.3.6 is out! drumkv1 is an old-school drum-kit sampler synthesizer with stereo fx. LV2 URI: http://drumkv1.sourceforge.net/lv2 website: http://drumkv1.sourceforge.net downloads: http://sourceforge.net/projects/drumkv1/files - source tarball: http://downloads.sourceforge.net/drumkv1/drumkv1-0.3.6.tar.gz - source package: http://downloads.sourceforge.net/drumkv1/drumkv1-0.3.6-9.rncbc.suse131.src.… - binary packages: http://downloads.sourceforge.net/drumkv1/drumkv1-0.3.6-9.rncbc.suse131.i586… http://downloads.sourceforge.net/drumkv1/drumkv1-0.3.6-9.rncbc.suse131.x86_… last but not least, the late Mike November closing the TYOQA era, * Qtractor - An Audio/MIDI multi-track sequencer * Qtractor 0.5.12 (mike november) is out! Qtractor is an audio/MIDI multi-track sequencer application written in C++ with the Qt4 framework. Target platform is Linux, where the Jack Audio Connection Kit (JACK) for audio and the Advanced Linux Sound Architecture (ALSA) 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 downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://downloads.sourceforge.net/qtractor/qtractor-0.5.12.tar.gz - source package: http://downloads.sourceforge.net/qtractor/qtractor-0.5.12-8.rncbc.suse131.s… - binary packages: http://downloads.sourceforge.net/qtractor/qtractor-0.5.12-8.rncbc.suse131.i… http://downloads.sourceforge.net/qtractor/qtractor-0.5.12-8.rncbc.suse131.x… Enjoy && have a very happy new year! -- rncbc aka. Rui Nuno Capela

11 years, 11 months

notation software

by David Santamauro

Hi, It's been a while since I researched notation software. What are the major players in the linux world? What is being actively maintained? What is new and cutting edge? Note: I use lilypond for printed scores but I'm looking for some distinct functionality for in-score composing and orchestrating: - individual jack midi routing at least at the staff level, better if staff supported multiple voices and each could be routed separately. - step input with both external keyboard as well as mouse - customization for in-score articulations, e.g., staccato -> channel change or slur/legato -> insert note ( for key switch software instruments) - lilypond and/or midi export functionality. I'd appreciate any advice. thanks, David

11 years, 11 months

qjackctl and the hardware latency setting

by Maciej (Matchek) Bliziński

Hello list, I've come across a problem where the hardware latency numbers entered into qjackctl setup window don't take effect. I wrote up the details here: http://quinoa.blizinski.pl/~maciej/latency/calibration-problems.html The workaround was to start jackd from command line and pass the -I and -O options that way. It is possible (but not certain) that the problem was caused by qjackctl. I wrote a post on the qjackctl forum, but I'm not sure how much attention it gets. http://www.rncbc.org/drupal/node/749 Since my setup is fairly common components: Ubuntu 13.10 with ardour, jackd and qjackctl installed from packages, it sounds like I shouldn't be the only person to experience this problem. Has anyone else come across that? Maciej

11 years, 11 months

QMidiArp 0.6.0 Initial release with LV2 plugins

by Frank Kober

QMidiArp 0.6.0 is out, since of course it cannot miss the huge TGV train of Q-Application updates just racing by for the new year! This release includes LV2 plugins of the three QMidiArp modules. They are synchronizable to the transport info provided by different hosts in different ways, and they work well with the new Qtractor, thanks to Rui for updates regarding this. I don't claim that I have fully understood LV2 host-GUI communication, but I found the recent sisco plugin by Robin Gareaus very instructive for this, thanks! Happy new year! Frank --------------------------------------- http://qmidiarp.sourceforge.net Direct download: http://sourceforge.net/projects/qmidiarp/files/qmidiarp/0.6.0/qmidiarp-0.6.… ---------------------------------------- qmidiarp-0.6.0 (2014-01-01) New Features o LV2 Plugins are now available for Arp, LFO and Seq modules - They have full functionality as known from the standalone application except MIDI control, which can be provided by the host - The LFO plugin also has a LV2 control output scaled from 0 to 1 - When the 'Sync to host' option is checked, the plugins support transport LV2 atom data from hosts as well as host transport information available from designated lv2 time ports (Qtractor, thanks Rui!) - Arp pattern presets are available in the LV2 module but cannot be written to the .qmidiarprc file. This has to be done with the standalone application - On hosts with small atom port capacities that do not honor the lv2 rsz:MinimumSize property, there will be issues with displaying very large LFO waveforms - Features of QMidiArp beyond the modules themselves (including global storage) are not available Fixed Bugs o Trying to open an inexistent file from the recent files menu led to crash (reported by Frank Neumann)

11 years, 11 months

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Linux-audio-user January 2014