Linux-audio-user August 2018

linux-audio-user@lists.linuxaudio.org

47 participants
44 discussions

by Tim Goetze

http://quitte.de/dsp/caps.html The latest release of the caps audio plugin suite contains a number of bug fixes and improvements as well as changes intended to make it more suitable for low-power systems. http://quitte.de/dsp/caps.html#CHANGES Most notably, support for a variety of little-used features has been dropped, reducing the binary size by roughly a third. There's also a new plugin implementing simplistic linear emulation of several guitar amplifier loudspeaker cabinets with reduced computational complexity: http://quitte.de/dsp/caps.html#CabinetIII The compressor plugins now report current gain reduction: http://quitte.de/dsp/caps.html#Compress http://quitte.de/dsp/caps_0.9.24.tar.bz2 Cheers, Tim

6 years, 2 months

free/libre/open online music distribution

by Wayne DePrince Jr.

ahoy all, i have been doing some research into free/libre software and/or services for music distribution. my preferences are a *customizable* static HTML+CSS+JavaScript site (e.g. like the current crop of static site generators https://staticsitegenerators.net ) that i can host myself which allows streaming and free/libre downloads of releases/tracks. basically i am looking for a simple static site generator that is album/track/audio aware, though i am open to any solutions available. my current list is small and all save one require a full-blown CMS+DB install: * Pushtape http://pushtape.com - currently only Drupal based * CASH Music platform http://cashmusic.org - PHP+DB requirement for self hosting - also available as a free/beer service hosted by CASH Music with embeddable widgets - currently no streaming support * WordPress - there are some freemium plugins for hosting a music store, etc. but again i am trying to avoid the setup+maintenance of a full CMS * indieTorrent https://indietorrent.org - online only service - very interesting/cool manifesto https://indietorrent.org/docs/manifesto/ - not lots of activity but still kicking https://indietorrent.org/4rum/viewtopic.php?f=1&p=39#p39 - not specifically for self hosting but as it is open source it could be done others (ReverbNation, Jamendo, Magnatune, Bandcamp, Bandpage, thesixtyone, etc) are all either non-libre, non-self hosting, etc. if anyone has any items to add to this list, experience with a service, homemade solutions, etc. i would appreciate them sharing it. i figure since we all go through various amounts of trouble to follow our principles/passions/whatever by using free/libre tools when making music, sharing it would be no different. thanks, w

6 years, 3 months

Soundcraft Notepad 12 FX audio interface

by Carlo Ascani

Hi all, I am considering a Soundcraft Notepad 12 FX [1] as my main laptop audio interface. Is anyone aware about its Linux compatibility and software reliability? Being able to do some multi track recording would be awesome. Cheers [1] https://www.soundcraft.com/en-US/products/notepad-12fx -- Carlo Ascani aka 2pxSolidBlack https://2pxsolidblack.gitlab.io iam2pxsolidblack@freenode

6 years, 3 months

command line midi processing

by Francesco Ariis

Hello LAU, lately I have been playing with ABC notation [1]. ABC outputs to postscript/PDF and MIDI (a good output), but there some things I would like to change in automatic fashion. Example: anticipate the attack on some channels (string). Is there a command line Linux utility to mess with midi files, similar to what ImageMagick is for images? I know plenty of libraries in many programming languages, but before diving into those I would like not to reinvent the wheel. [1] http://trillian.mit.edu/~jc/music/abc/doc/ABCtut_Intro.html

6 years, 3 months

spectmorph-0.4.1

by Stefan Westerfeld

spectmorph-0.4.1 has been released. Overview of Changes in spectmorph-0.4.1: ---------------------------------------- * macOS is now supported: provide VST plugin for macOS >= 10.9 * Include instruments in source tarball and packages * Install instruments to system-wide location * New Instruments: Claudia Ah / Ih / Oh (female version of human voice) * Improved tools for instrument building - support displaying tuning in sminspector - implement "smooth-tune" command for reducing vibrato from recordings - minor encoder fixes/cleanups - smlive now supports enable/disable noise * VST plugin: fix automation in Cubase (define "effCanBeAutomated") * UI: use Source A / Source B instead of Left Source / Right Source * UI: update db label properly on grid instrument selection change * Avoid exporting symbols that don't belong to the SpectMorph namespace * Fix some LV2 ttl problems * Fix locale related problems when using atof() * Minor fixes and cleanups What is SpectMorph? ------------------- SpectMorph is a free software project which allows to analyze samples of musical instruments, and to combine them (morphing). It can be used to construct hybrid sounds, for instance a sound between a trumpet and a flute; or smooth transitions, for instance a sound that starts as a trumpet and then gradually changes to a flute. SpectMorph ships with many ready-to-use instruments which can be combined using morphing. SpectMorph is implemented in C++ and licensed under the GNU LGPL version 3 Integrating SpectMorph into your Work ------------------------------------- SpectMorph is currently available for Linux and Windows users. Here is a quick overview of how you can make music using SpectMorph. - VST Plugin, especially for proprietary solutions that don't support LV2. (Available on Linux and 64-bit Windows) - LV2 Plugin, for any sequencer that supports it. - JACK Client. - BEAST Module, integrating into BEASTs modular environment. Note that at this point, we may still change the way sound synthesis works, so newer versions of SpectMorph may sound (slightly) different than the current version. Links: ------ Website: http://www.spectmorph.org Download: http://www.spectmorph.org/downloads There are many audio demos on the website, which demonstrate morphing between instruments. -- Stefan Westerfeld, Hamburg/Germany, http://space.twc.de/~stefan

6 years, 3 months

Best filter for reducing condenser mic "crash" impact outdoors?

by David Kastrup

Hi, what do people use for damage control (prevention likely is a case for deadcats though I am not sure whether their absorption may be too much for this application) when condenser mics occasionally "plop" due to wind? One can hear this effect a few times on the outdoors "wasp" video <https://youtu.be/vKCdTh7h8f8> between 5:00 and the end (5:22). What I tried in that recording is using a high pass filter (at about 100Hz) with "Soft limiter" which supposedly maps something like -3dB to +∞dB to -3dB to 0dB. I think it was "Invada". The result is still unpleasant. Are there any better approaches, like some sort of smooth gating? As a note aside, I got really annoyed at snd_oxfw (Firewire via ALSA, no Ffado available) for a Mackie Onyx Satellite. At 96kHz sample frequency, xruns using Ardour about once per minute. Don't remember this being the case when I tried last time (with a Thinkpad T61 and an older CPU). Regardless whether using the built-in Ricoh Firewire controller of a T420, or an Expresscard controller with TI chip, using Jack or not, connected to mains power or not. I finally threw in the towel and used the analog TLR outputs on the Satellite into an RME Hammerfall (via Expresscard-to-Cardbus Adapter). I am not sure I really was satisfied with the result: I suspect that it went through A/D+D/A already before arriving at Main Out of the Satellite. The video from that attempt was sort of badly lit so I ultimately ditched it anyway. The one linked above was instead recorded with an Alesis iO|14 audio card, using Ffado and Jack (this requires blacklisting the ALSA Bebob driver which only produced hacked-up audio last time I tried it). I did not want to move my regular equipment (a large Mackie Onyx mixer) into the yard and at least had the Alesis still around from earlier experiments. I actually found the noise level of the Alesis a bit nicer than when using the Satellite preamps, but then the Satellite produces lacklustre phantom voltage (something like 35V or so). A final note on the mics (leaving the Linux-specific realm): I used hypercardioid Oktava MK-012 capsules (I think 0.5" diameter membranes). Would cardioid or even omni be less sensitive to wind as a rule? Or is this a solid "it depends" or "naaah"? All the best, thanks for any hints -- David Kastrup

6 years, 3 months

System Configuration: kernel, CPU frequency, hardware timers

by Kevin Cosgrove

Hi folks, Back in 2012 I scripted some post-installation customization for when I would build a new Linux machine. I suspect that all of what I did is no longer needed for today's systems. I'm writing to see if someone can confirm that. What I did came from these links: https://wiki.linuxaudio.org/wiki/system_configuration#the_kernel https://wiki.linuxaudio.org/wiki/system_configuration#cpu_frequency_scaling https://wiki.linuxaudio.org/wiki/system_configuration#hardware_timers My new system runs the 4.17.17 kernel along with the rest of Fedora-27. What do you think? Do I need to taylor the new machine in the above ways? Thanks! P.S.: My script is below, for the curious. #!/bin/sh # $Id: 36-linux_musicians,v 1.4 2012/11/16 05:56:14 kevinc Exp $ DATE=`date +%F-%T` # http://wiki.linuxmusicians.com/doku.php?id=system_configuration#the_kernel sudo cp /etc/default/grub /etc/default/grub-${DATE} sudo cp /boot/grub2/grub.cfg /boot/grub2/grub.cfg-${DATE} # cp /etc/default/grub grub sudo perl -p -i -e 's/(^GRUB_CMDLINE_LINUX=\"nomodeset.*rhgb) quiet$\"/$1 quiet threadirqs\"/' /etc/default/grub sudo /sbin/grub2-mkconfig -o /boot/grub2/grub.cfg # http://wiki.linuxmusicians.com/doku.php?id=system_configuration#cpu_frequen… # echo -n performance \ # | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor sudo touch /etc/rc.d/rc.local cp /etc/rc.d/rc.local rc.local_cpufreq cat << EOF >> rc.local_cpufreq #!/bin/sh for cpu in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor do echo -n performance > \$cpu done echo 3072 > /sys/class/rtc/rtc0/max_user_freq EOF sudo cp rc.local_cpufreq /etc/rc.d/rc.local sudo chmod 755 /etc/rc.d/rc.local # http://wiki.linuxmusicians.com/doku.php?id=system_configuration#hardware_ti… /bin/rm -f 40-timer-permissions.rules cat << EOF > 40-timer-permissions.rules KERNEL=="rtc0", GROUP="audio" KERNEL=="hpet", GROUP="audio" EOF sudo cp 40-timer-permissions.rules /etc/udev/rules.d/ sudo chmod 644 /etc/udev/rules.d/40-timer-permissions.rules cat << EOF > 60-max-user-freq.conf # High Precision Event Timer for performance audio/MIDI dev.hpet.max-user-freq=3072 EOF sudo cp 60-max-user-freq.conf /etc/sysctl.d/ sudo chmod 644 /etc/sysctl.d/60-max-user-freq.conf cat << EOF > 60-vm.swappiness.conf # Delay start of use of swap partitions vm.swappiness = 10 EOF sudo cp 60-vm.swappiness.conf /etc/sysctl.d/ sudo chmod 644 /etc/sysctl.d/60-vm.swappiness.conf cat << EOF > 93-audio_limits.conf # Increase priority of audio applications # # maximum realtime priority @audio - rtprio 90 # maximum locked-in-memory address space (KB) @audio - memlock 2000000 EOF sudo cp 93-audio_limits.conf /etc/security/limits.d/ sudo chmod 644 /etc/security/limits.d/93-audio_limits.conf exit

6 years, 3 months

libsndfile current info on mp3 support

by Jeanette C.

Hey hey, is there any further information on the mp3 support within libsndfile? More current than Q&A 21 in the FAQ? TIA and best wishes, Jeanette -------- * Website: http://juliencoder.de - for summer is a state of sound * SoundCloud: https://soundcloud.com/jeanette_c * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * GitHub: https://github.com/jeanette-c * Twitter: https://twitter.com/jeanette_c_s I love the things you say And I love the love your touch conveys <3 (Britney Spears)

6 years, 4 months

System Configuration: kernel, CPU frequency, hardware timers

by Kevin Cosgrove

6 years, 4 months

noise problem, need some help

by Dave Phillips

Greetings, Recently my computer rebooted after a power outage and after having an uptime of many months. I'm running Fedora 23 here, with Fernando's rt kernel from Planet CCRMA, on hardware that includes an AMD FX6300, 16G memory, a big hard drive, and nVidia graphics. For those months of uptime I've enjoyed a smooth-running system with very few issues. The CPU runs in performance mode, and as far as I can tell the system has been sweetly optimized for realtime audio. Alas, after rebooting I now have extremely annoying issues with noise from my wireless mouse when running VCV Rack, which is a problem I never had before the reboot. I suspect IRQ assignment, but I'm awfully rusty at troubleshooting so I'm asking the group for advice. My checklist so far: 1. Running the correct kernel ? Linux The6300 4.6.7-200.rt14.1.fc23.ccrma.x86_64+rt #1 SMP PREEMPT RT Sat Oct 1 16:06:12 PDT 2016 x86_64 x86_64 x86_64 GNU/Linux 2. CPU in Performance mode ? 'cat /proc/cpuinfo' reports 'cpu MHz: 3500.000' for all cores 3. rtprio set ? $ rtirq status PID CLS RTPRIO NI PRI %CPU STAT COMMAND 169 FF 70 - 110 0.0 S irq/8-rtc0 748 FF 69 - 109 0.0 S irq/19-snd_hda_ 764 FF 69 - 109 2.0 S irq/20-snd_ice1 166 FF 68 - 108 0.0 S irq/1-i8042 85 FF 50 - 90 0.0 S irq/9-acpi 138 FF 50 - 90 0.0 S irq/22-ahci[000 150 FF 50 - 90 0.0 S irq/17-ehci_hcd 151 FF 50 - 90 0.0 S irq/19-ehci_hcd 153 FF 50 - 90 0.0 S irq/16-ohci_hcd 154 FF 50 - 90 0.0 S irq/16-ohci_hcd 155 FF 50 - 90 0.0 S irq/18-ohci_hcd 156 FF 50 - 90 0.0 S irq/18-ohci_hcd 159 FF 50 - 90 0.0 S irq/18-ohci_hcd 430 FF 50 - 90 0.0 S irq/14-pata_ati 431 FF 50 - 90 0.0 S irq/15-pata_ati 706 FF 50 - 90 0.0 S irq/7-parport0 1062 FF 50 - 90 0.0 S irq/26-enp2s0 1178 FF 50 - 90 0.8 S irq/27-nvidia ... Permissions are correct, and I have already tried switching the wireless dongle to a different USB port. So what am I missing, what have I forgotten ? The machine is the same as before the reboot, the kernel is the same, and as far as I can tell the audio system is the same as it ever was. I'm at a bit of a loss here, any and all help will be appreciated. Best regards, dp

6 years, 4 months

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Linux-audio-user August 2018