Neil C Smith | 4 Aug 14:51 2015

[LAU] Praxis LIVE v2 - audio coding preview

Hi all,

Just wanted to share a sneak preview of the audio coding support
coming in the next release of Praxis LIVE - some simple live synth

Praxis LIVE is a hybrid visual IDE for (live) creative coding -

Some other examples of working with video, OpenGL and GLSL here -

Simple video -
3D and shaders -

Best wishes,



Neil C Smith
Artist : Technologist : Adviser

Praxis LIVE - hybrid visual IDE for live creative coding -
Digital Prisoners - interactive spaces and projections -
Dave Phillips | 4 Aug 13:56 2015

[LAU] Hojit - more music


A simple groove demo of (mostly) sounds from Shpitz Audio. The 
interlopers are TAL's NoiseMaker and some drum loops from Beta Monkey. 
Nothing serious here, it's just a demo.


Peter P. | 3 Aug 23:44 2015

[LAU] 5 channel usb sound card


I am looking for a USB sound card that has at least 5 channels of
outputs and which runs under Linux (a Raspberry Pi 2 in my case) and
is not too expensive. Does anyone have any recommendations?

Thank you!
Gerhard Zintel | 2 Aug 22:26 2015

[LAU] jackd core dumps in duplex mode

Hi list,

I have been running jackd successfully for years now but since some 
time, I can either playback using 
$ /usr/bin/jackd -dalsa -dhw:0 -r44100 -p512 -n2 -P

or capture using
$ /usr/bin/jackd -dalsa -dhw:0 -r44100 -p512 -n2 -C

but trying to use duplex mode
$ /usr/bin/jackd -dalsa -dhw:0 -r44100 -p512 -n2

jackd gives me:
======== snip ==========
jackd 0.122.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben 
Hohn and oth
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details

JACK compiled with System V SHM support.
loading driver ..
apparent rate = 44100
creating alsa driver ... hw:0|hw:0|512|2|44100|0|0|nomon|swmeter|-|
control device hw:0
configuring for 44100Hz, period = 512 frames (11.6 ms), buffer = 2 
ALSA: final selected sample format for capture: 32bit integer 
(Continue reading)

Hermann Meyer | 1 Aug 08:29 2015

[LAU] [LAA] Guitarix 0.33.0 release

Release 0.33.0 is out,

Guitarix is a tube amplifier simulation for
jack (Linux), with an additional mono and a stereo effect rack.
Guitarix includes a large list of plugins[*] and support LADSPA / LV2 
plugs as well.

The guitarix engine is designed for LIVE usage, and feature ultra fast, 
glitch and click free, preset switching and is full Midi (learn)
and remote (Web-interface/ GUI) controllable (bluez / avahi)


This release comes with the old User Interface and reflect only changes 
in the plugin section.

New Plugins in guitarix

A new Wah plugin with manual/auto/alien mode and the following emulated 
wah wah's to select from:

Colorsond Wah
DallasArbiter Wah
Foxx Wah
Maestro Boomer Wah
Selmer Wah
Vox Wah

A new Fuzz section with emulations of the:
(Continue reading)

Peter P. | 1 Aug 00:59 2015

[LAU] Jack max ports question

Hi list,

today I got some time to play around with RME's Madiface (and its
ExpressCard) under Linux/Jack. The card uses Thomas' old hdspmixer with
correct display and routing abilities, it's simply awesome to have 64Ins
and 64outs on a Linux laptop!

However I didn't get beyond the following weird problem:

Starting PureData outputting 64 channels via jack as
	pd -jack -channels 64
works and connects and outputs to the Madiface's hardware outs.

If I try to start other audio software (mplayer, alsaplayer) asking them
to output to the first two jack outputs (while Pd is also using them),
I get in qjackctl's message window
	no ports available!

and in mplayer
	cannot deliver port registration request
	[JACK] not enough ports available
	Failed to initialize audio driver 'jack'

and in alsaplayer
	cannot deliver port registration request
	cannot deliver port registration request
	Segmentation fault

all followed by a massive xrun in qjackctls message window
	**** alsa_pcm: xrun of at least 4995.700 msecs
(Continue reading)

Rui Nuno Capela | 27 Jul 15:44 2015

[LAU] [ANN] Qtractor 0.7.0 - The Muon Base is out!


Stepping up to Summer'15 release frenzy stage scene, in it's fourth and 
hopefully last act,

   Qtractor 0.7.0 (muon base beta) is out!

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.

As a major highlight to this release, there's the advent of regular MIDI 
controllers mapping/assignment to main application menu command actions, 
just like normal PC-keyboard shortcuts, is being introduced (cf. main 
menu Help/Shortcuts...).

Have a 'hotta' Summer'15 ;)



Project page:

(Continue reading)

Nicola | 27 Jul 11:44 2015

[LAU] Octave plugin fx

Hi all,

Does anybody know if there are good octave plugins/standalone available on Linux?
My aim would be to use my guitar also as a bass guitar avoiding to buy one.
Anybody tried this solution do you think is feasible?
Does guitarix for instance provide a tool like this now (I'm using an non-updated version on my Linux squeeze box)?

Many thanks

Sent from my Android device with K-9 Mail. Please excuse my brevity.

Linux-audio-user mailing list
Ralf Mardorf | 26 Jul 12:17 2015

[LAU] MIDI jitter - Was: outfitting a computer for songwriting in linux?

Jeremy, we shouldn't discuss this in the original thread.

There are latency test measurements in the mailing list archive. PCI and
PCIe cards show better results, IOW less MIDI jitter. There are also
explanations why USB suffers from more jitter.

The point of difference is, if the MIDI jitter is audible. It is! The
measurements might not provide correct results. To measure a system by
itself is a bad test and to measure a MIDI loop in addition is tricky.

Jakob (living in Augsburg) from a Linux mailing list (perhaps LAU or
LAD) years ago send me a board to loop through MIDI and that provides an
audio output, to record the MIDI signal to an audio track. I never had
time and interest to continued my MIDI jitter tests, so I still didn't
use it. I guess this would be a better test, then the latency test.

Howsoever, it's better to use PCI or PCIe, IIRC some USB interfaces
even fail(ed) the latency test that measures a MIDI loop. The USB
interface I own doesn't fail the test, but I'm anyway not satisfied and
use PCI and PCIe MIDI only.

That's it, I can't provide more information and I'm not willing to
search the mailing lists archives.

Karen Lewellen | 26 Jul 03:31 2015

[LAU] outfitting a computer for songwriting in linux?

Hi All,
I've been a reader on the list for a while, not a poster until now.
I am preparing  to outfit a computer  for songwriting in Linux.
I will be using the command line  notation  options, of which there are 
a few from Lillypond to muscript.
I am hoping that how I picture this will match the creative reality smiles.
My first question is this.
some high end soundcards that are supported in Debian?  I know its been 
updated, but I intend using squeeze for a start.  Getting the floor solid 
before say adding  updated furniture.
While I know that four duplex cards are common, I want the best quality  I 
can find for the work.
  say if you <hope this makes sense> wanted to connect a full sized piano 
keyboard   to the card?
Thanks in advance,

[LAU] Using guitarix

Hello !

The clean/drive amp sounds are interesting, the tube choice is fun.
Then I add a graphic eq, it modifies the sound not nicely (adds
distortion), I remove it, the sound remains modified.  It is not back
to the amp sound before adding the graphic eq.  'Sounds' like a bug :)

Rotating the buttons with the mouse wheel can be tedious with some.
Left clicking will move the window.  Right clicking seems to only allow
for minuet adjustments.

This is guitarix from upstream, gotten a few days ago.