Linux-audio-user January 2013

linux-audio-user@lists.linuxaudio.org

140 participants
130 discussions

by Brent Busby

First off, Happy New Year to all! :) Can anyone recommend a quick way of seeing the differences highlighted visually between two channels in a stereo sample...sort of like a graphical 'diff' for waveforms? I think I may have some Akai MPC2000 samples that somehow were saved by the Akai as mono samples even though they actually contain two channels and are really stereo: Using 'sndfile-info' on them reports them as mono, but it's just looking at the 22nd byte in the file, which should contain 0x00 or 0x01 to say if it is mono or stereo. The file contains 0x00 in that location, so sndfile-info believes that it's mono because the file header says so. However, if I flip the bit in a hex editor and resave the file, now I can load the file in a sample editor and it seems to have two channels which play at double speed. I'm still not positive I'm hearing stereo (if I am, it's very subtle), but I'm definitely seeing two channels visually, and I know this sample was sampled on the Akai in stereo. Any way to do a graphical comparison that will highlight even small channel waveform differences? -- + Brent A. Busby + "We've all heard that a million monkeys + Sr. UNIX Systems Admin + banging on a million typewriters will + University of Chicago + eventually reproduce the entire works of + James Franck Institute + Shakespeare. Now, thanks to the Internet, + Materials Research Ctr + we know this is not true." -Robert Wilensky

11 years, 11 months

Re: [LAU] [OT] Open Source Portable Recorder?

by wes schreiner

On 01/09/2013 02:27 AM, Burkhard Woelfel wrote: > What size is that buffer? Not much. In the Tascam DR-40 it is two seconds. In the Zoom H4N it is two seconds unless recording 96KHz 4 channel, then it's only one second. wes

11 years, 11 months

linuxaudio.org scheduled maintanance

by Robin Gareus

Hi all, I'm not quite sure how to interpret this, but it sounds like linuxaudio.org will be offline for a short time (failover period) coming Saturday January 12th 8am EST. -------- Original Message -------- Just wanted to make sure you were aware of the upcoming maintenance this Saturday. Maintenance for the central storage system known as minnow.cc.vt.edu is schedule for Saturday, January 12 starting at 8am. Several hardware components in the filer head needs to be replaced. Since this is a cluster storage system, the maintenance will be performed in failover mode, so minnow services will continue to be available. During the failover, services will pause until the failover is complete.

11 years, 11 months

Re: [LAU] [LAD] Announcing PHASEX-0.14.96

by Dave Phillips

Hi William, Building the latest git pull for 0.14.97 on a completely updated Arch 64 system: [dlphilp@bigblack phasex]$ aclocal configure.ac:695: error: 'AM_CONFIG_HEADER': this macro is obsolete. You should use the 'AC_CONFIG_HEADERS' macro instead. /usr/share/aclocal-1.13/obsolete-err.m4:12: AM_CONFIG_HEADER is expanded from... configure.ac:695: the top level autom4te: /usr/bin/m4 failed with exit status: 1 aclocal: error: echo failed with exit status: 1 I followed the advice, updated the macro declaration, and aclocal ran to its end, after which the rest of the autotools ran without complaint. I used the following build configuration: ./configure --enable-cpu-power --enable-arch=native --prefix=/usr/local No reported errors during the build config, Phasex compiled without problems. CPU is an AMD64 3200+, single-core, with 4G RAM, GCC 4.7.2. From uname : Linux 3.7.1-2-ARCH #1 SMP PREEMPT x86_64 GNU/Linux Alas, when I start Phasex it segfaults immediately: [dlphilp@bigblack ~]$ phasex Not sending deprecated LASH_Client_Name event LASH client initialized. (LASH_Client_Name='phasex'). Main: LASH client started. (phasex:1239): Gtk-WARNING **: Unable to locate theme engine in module_path: "nodoka", (phasex:1239): Gtk-WARNING **: Unable to locate theme engine in module_path: "nodoka", Segmentation fault (core dumped) Bummer. Also, the splash indicates 0.14.96 but the git pull specified 0.14.97. There is no previous version of Phasex on my system. Suggestions are welcome. :) Best, dp

11 years, 11 months

[ann] CAPS 0.9.4

by Tim Goetze

New in CAPS 0.9.4: * selectable oversampling ratios for AmpVTS (2x,4x,8x) * selectable sounds for Click (box, stick, beep; the second being very close to the sound of the unit in 0.4.x) * further smoothening of ChorusII modulation * selectable oversampling ratios for Compress (2x,4x) Also, a serious issue with Compress has been fixed: gain had been applied before saturation, greatly reducing the effectiveness of the unit. It's squashing smoothly now :) The 10-band Eq has been fixed and now has a reasonably flat frequency response. http://quitte.de/dsp/caps.html http://quitte.de/dsp/caps.html#AmpVTS http://quitte.de/dsp/caps.html#Compress http://quitte.de/dsp/caps.html#Click http://quitte.de/dsp/caps.html#Eq

11 years, 11 months

[OT] a record created on a 3d printer

by Jörn Nettingsmeier

check this out: http://www.instructables.com/id/3D-Printed-Record/ the sound quality is quite bad, but it turns out the author neglected to apply the RIAA curve to the master before rendering the groove, so it could be made to sound much better. but that's not really the point :) reminds me of a band i heard of in the 80s (forgot the name) who released a single which, if recorded to some data cassette format, would yield a computer game... best, jörn -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net

11 years, 11 months

Pro Audio? OT rant.

by John Murphy

As a newcomer to the "Pro Audio" industry and a long time *nix user (somewhat mitigating this outburst here) I must say I'm not impressed. I've spent thousands recently and found suppliers either just don't 'know' the products they sell, or purposely misrepresent them. In one instance it took nearly a month to obtain a refund! For RME products; the 'bundled' word seems to be the one to watch out for. If it's a Multiface II bundled with a card, then double check. Same for UCX bundled with remote controller. I'd be getting on with building a new rack right now, but I've just received half a pair of brackets from a UK supplier and there's hardly anything more useless than half a pair of rack brackets. Grr. Why must I have so many microphone inputs? I'm a solo poet/musician with one mic. and enough places to plug it in to sink a battleship. Synth manufacturers: Why no ADAT out? But what really annoys me are the presumptions I had about my best synthesiser/drum machine's MIDI capabilities. You'd probably similarly presume an state-of-the-art instrument designed by Dave Smith and Roger Linn would be spot on in the MIDI dept, but it isn't. Six stereo 'voice' outs, but FIXED PITCH! To be fair(er) the OS is still in development... I don't resent Dave Smith getting a Technical Grammy though. Not at all. I've been having fun with MIDI for an awful long time. http://www.factmag.com/2012/12/13/dave-smith-father-of-midi-to-receive-spec… -- John. (Definitely feeling better for having shared my frustration.)

11 years, 11 months

[ANN] MusE 2.1 released

by Robert Jonsson

MusE 2.1 Jan 06, 2013 Happy new year everybody and happy new MusE release! We've tried hard to break tradition and release somewhat quicker than what we usually been able to. So without further ado, here we are with a shiny 2.1 release. Assortment of topics worked on this time around are: * Native VST support, first drop: effect rack isn't supported yet and some synths are misbehaving a bit but it should be usable. * New type of drum track with easier instrument handling * Improved Wave Editor. * Improved midi import/export * Longtime wierdness in MusE, song-type is finally removed * Improved: Deicsonze soft synthesizer: Fixed crash, bugs, added ladspa plugins * Added: Request from forums: Auto-start Jack upon MusE startup. Command-line disable switch -J added * Added aftertouch controller handling * Piano KB and drum list show coloured dots when per-pitch controllers exist or have data. * Improved: Instrument Editor (controller tab): Redesigned. Fixed MANY bugs * Improved: Midi controller graph 'Ctrl' popup menus now unified (cascading). * Improved: built-in templates and removed lots of unneeded definitions * Improved: Velocity graphs. Icon for showing per-note or all velocities * Improved: Piano KB has current selected note (yellow). For velocity/polyaftertouch/other per-note ctrls * Added 'speaker' icon to drum edit. And drum list and piano keyboard now obey the 'speaker' icon * Improved: Multi-port (aka multi-channel) midi import and export * Added Gain knob on channel strip for audio tracks * Changed WaveTrack and AudioInput to create mono tracks instead of stereo * Added: Informative text on Undo/Redo buttons/menu text/tooltips ("Undo AddTrack" etc). * Fixed CR:3567893 Play Event on note creation * Bug 3555569, 3555572: New informative ERROR, WARNING and HINT messages in cmake build script. * Bug 3555581: No synths listed in Edit menu: main.cpp: Move initMidiSynth() ahead of MusE. * Feature request 3565102: FLAC audio file import. * Fix for forum topic "Ordering of simultaneous events". * Summer sleep is over! plugins can now be grouped * Finished the Sysex Editor in the Instrument Editor. * increased zoom range in arranger, reversed zoom in wave editor * Internal fluidsynth and simpledrums search project dir for missing sounds to ease portability, and if no sounds are found a load file dialog is shown For more information and additional changes see the changelog: http://lmuse.svn.sourceforge.net/viewvc/lmuse/trunk/muse2/ChangeLog?revisio… Find the download at: https://sourceforge.net/projects/lmuse/files/ MusE on! The MusE Team

11 years, 11 months

48k vs. 44.1k

by Len Ovens

>From earlier talk about sample rates, it appears that for recording audio, 48k is better than 44.1. Having decided that, what other issues cross my path if I default my audio rate to 48k? All of my softsynths seem to work... I do wonder about samplers though. Are the samples mostly in 44.1k if they come on a CD? Would that make them off-key when used? Would they get rate-changed on the fly? Would that use more CPU? (questions, questions, questions) It does not seem to affect my desktop, flash, ogg, mp3, ac3 etc. all playback fine. Pulse seems to be doing more work though at least when playing a CD. I'm pushing it pretty hard though, I have it bridged to jackdbus with -p64 so Pulse has to keep up. I'm just wondering why Ubuntu (which presumably means Debian too), qjackctl, Pulse and lots of other audio apps all seem to default to 44.1k. Speaking as one of the devs for the Ubuntu Studio distro, I'm wondering how much trouble I'm going to get for asking for 48k default sample rate in audio. -- Len Ovens www.OvenWerks.net

11 years, 11 months

[ANN] Praxis LIVE build:121231

by Neil C Smith

Hi All, A slightly-belated Happy New Year to you all, and notification of a new release of Praxis LIVE (build:121231). Praxis LIVE is an open-source, graphical environment for rapid development of intermedia performance tools, projections and interactive spaces. This release brings a range of performance improvements to the video pipeline, some useful UI improvements, and support for up to 16 channels of audio IO. There is also some early support for physical computing using the excellent TinkerForge (http://www.tinkerforge.com/). Praxis LIVE is now available as a .deb pacakge or as a ZIP (for un-installed usage). Website (with downloads and manual) - http://code.google.com/p/praxis Release notes - http://code.google.com/p/praxis/wiki/ReleaseNotes Blog post (with TinkerForge vid) - http://praxisintermedia.wordpress.com/2013/01/07/new-year-new-praxis-live/ Thanks and best wishes, Neil -- Neil C Smith Artist : Technologist : Adviser http://neilcsmith.net Praxis LIVE - open-source, graphical environment for rapid development of intermedia performance tools, projections and interactive spaces - http://code.google.com/p/praxis OpenEye - specialist web solutions for the cultural, education, charitable and local government sectors - http://openeye.info

11 years, 11 months

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Linux-audio-user January 2013