Linux-audio-user

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3 participants
20662 discussions

by Michael Jarosch

Hi there! This is a somewhat special question which has not so much to do with linux-audio stuff - but as there are quite a few people here dealing with electrics / electronics and some of them even earn their money as event technicians you might get in touch with special measurement equipment like a VDE 0701/0702-tester. As you might know, most manufacturers of those devices offer software to ease the administration of your testing pool, but most of them still life in the 90s and make them windows only. So here I am, asking you if you are using or knowing a VDE 0701/0702 -testing device manufacturer that is modern enough to master the (not so secret) secrets of cross-platform software engineering or opened their devices and protocols in that way, that I can easily access them with linux / open source tools. Greets! Mitsch

10 years, 1 month

Problem getting started with Midi editing - no sound!

by David Sumbler

I have hesitated for weeks to post here with such a basic and possibly stupid problem, but I am at my wits end with this. I run Ubuntu 12.04 on a desktop computer and also on a small notebook. Sound is fine on both of them, and I can play midi files through tiMidity with no problem. I want to use a midi-capable electric piano as an input device, and I reckoned the first thing to do was to get some suitable software and make sure I could play a midi file from a midi editor. I have QjackCtl, Qtractor (I also have Muse) and Qsynth installed. I have spent weeks, on and off, trying to solve the basic problem of getting some sound from Qtractor (or Muse), but although both the editor and QjackCtl show that an imported midi file is actually being played, I get no sound whatsoever. This is true for both computers, even though their hardware is pretty different. As I said earlier, the sound on both computers is fine in other contexts, so it is almost certainly some fundamental error on my part, but I have no idea what is wrong. I have tried all sorts of different sets of connections in QjackCtl, but never heard a note yet! Having read various posts in the forum archive, I tried running jack-metro. QjackCtl shows that the metronome is running, but connecting the metronome to the system outputs produces no sound, so the problem seems to be at this level. If anyone feels they have the patience to try to point me in the right direction, I shall be very grateful indeed. David

10 years, 1 month

Music recorded with Linux: c2014-26

by jonetsu＠teksavvy.com

Hello, This one is a laid back journey of some 10 minutes, developing slowly and fading away, whitewash against the shore. This is a one time recording as I do not expect re-working this one, apart from this mixdown here. It simply happened, during a few hours last year. Listening to it at this time of the year for mixing it down does have an autumnal feeling. The theme kind of longs warmly for things summer past. Enjoy. https://soundcloud.com/nominal6/c2014-26 Cheers. Details: Recorded using Ardour 3. Plugins are Calf 5-band EQ and Reverb. Master bus uses Robin Gareus' 4-band parametric EQ and Steve Harris' Fast Lookahead Limiter. The Sonatina free sample library provides cymbals, concert harp, and solo violin. Cymbals were triggered using an Alesis Control Pad and regular drum sticks. On the instrument front, the accoustic guitar is a Shiraki 6 strings. Whereas the previous piece c2015-15 did not have any bass instrument, here there are two. Soloing bass is a Tanglewood accoustic bass guitar, pulsating bass is made of both M-Audio pro88 accoustic bass and Korg Microstation 'bad boy', which also provides some 'Night Electric Piano'. The Korg Wavedrum playing provides tabla variations and kick/snare, played by hand and fed through a passive direct box, with a bit of Steve Harris' Multiband EQ applied to the tablas, and Calf Limiter, 5-band EQ and Reverb to the kick/snare. Pads are standard warmpads from M-Audio pro88. Intro bird noise is provided by the free Reaktor5 Space Drone.

10 years, 1 month

how to connect computers with Netone?

by Menno

Hi, i want to connect 2 computers (Linux Mint + KXStudio) and use the JackTransport on one (the master) to guide the other (the slave) - On the master i have jack2 running and Claudia. i run in terminal: jack_netsource -H 192.168.1.128 <-- = address of master The reply = Not Connected and i see in Claudia a small window appear called "NetJack". It has 2 inputs, 2 outputs and a midi in and out. And, yes, they are not connected to anything. - On the slave i have jack2 running and Claudia. i run in terminal: jack_netsource -s 192.168.1.129 <-- = address of slave This is the output: menno@huiskamer:~$ jack_netsource -s 192.168.1.129 Cannot connect to server socket err = No such file or directory Cannot connect to server request channel Cannot connect to server socket err = No such file or directory Cannot connect to server request channel Cannot connect to server socket err = No such file or directory Cannot connect to server request channel Cannot connect to server socket err = No such file or directory Cannot connect to server request channel Cannot connect to server socket err = No such file or directory Cannot connect to server request channel Cannot connect to server socket err = No such file or directory Cannot connect to server request channel jack server is not running or cannot be started JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock jack_client_open() failed, status = 0x11 Is the JACK server running ? Is this the way to go to connect computers? -- View this message in context: http://linux-audio.4202.n7.nabble.com/how-to-connect-computers-with-Netone-… Sent from the linux-audio-user mailing list archive at Nabble.com.

10 years, 1 month

Music made with Linux: c2015-15

by jonetsu＠teksavvy.com

Here's one I made recently as a very first attempt in trying to mix down all tracks in a cohesive manner. All comments welcomed, technical and even on the tune itself ! https://soundcloud.com/nominal6/c2015-15 Cheers.

10 years, 1 month

Super-threaded tree processing with GSequencer v0.6.8

by Joël Krähemann

Hi, After a few refactorings its finally here. Super-threaded audio tree computing for GSequencer v0.6.8 http://gsequencer.org/download.html The config file located in $(HOME)/.gsequencer/ags.conf should look like following: [generic] builtin-theme=false autosave-thread=false segmentation=4/4 [thread] model=super-threaded super-threaded-scope=channel lock-global=ags-thread lock-parent=ags-recycling-thread [device] samplerate=44100 buffer-size=940 pcm-channels=2 dsp-channels=2 alsa-handle=hw:0,0 [recall] auto-sense=true cheers, Joël

10 years, 1 month

[OT] Coursera: Audio Signal Processing for Music Applications

by Dave Phillips

Saw this announced on the Linux Musicians site, thought it may be of interest to some folks here. (Sorry if it's a repost). https://www.coursera.org/course/audio Instructors are professors Xavier Serra and Julius O. Smith III, two very well-known DSP worthies. Course syllabus : Week 1: Introduction; basic mathematics Week 2: Discrete Fourier transform Week 3: Fourier transform properties Week 4: Short-time Fourier transform Week 5: Sinusoidal model Week 6: Harmonic model Week 7: Sinusoidal plus residual modeling Week 8: Sound transformations Week 9: Sound/music description Week 10: Concluding topics; beyond audio signal processing Best, dp

10 years, 1 month

New Yoshimi Release :)

by Will Godfrey

We are pleased to announce the release of Yoshimi V1.3.6 Principal features for this release are the introduction of controls from the command line, covering many setup options, as well as extensive root/bank/instrument management. Some of these new controls are also available to MIDI via new NRPNs. Vector control has been extended so that there are four independent 'features' that each axis can control, ALSA audio has had a makeover, and will now work at your sound card's best bit depth - not just 16 bit (as it used to be). In the 'examples' directory there is a complete song set, 'OutThere.mid' and 'OutThere.xmz'. Together these produce a fairly complex 12 part tune that makes Yoshimi work quite hard. More information on these and other features are in the 'doc' directory. Yoshimi source code can be obtained either from: http://sourceforge.net/projects/yoshimi or: https://github.com/Yoshimi/yoshimi Our mailing list is now: http://www.freelists.org/list/yoshimi -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

10 years, 1 month

Komplete Audio 6 + USB3

by Nicola Pandini

Hi list! I'm about to purchase a laptop with usb3 only ports (no usb2). I want to use it for live performances, with a full RT-preemt kernel. Has someone already test NI Komplete Audio 6 with USB3? Are there known issues? Thanks! Nicola

10 years, 1 month

How to run jack at 8kHz sr?

by Alessio Degani

Hi list, I'm writing some signal processing algorithm for real time processing that has to run on a 8 kHz sampling frequency embedded device. My code is in C and I wrote a simple jack client for testing my algorithms. For now, I'm using a sample frequency of 44.1 kHz but I want to test the behaviour of my code at 8 kHz. With my sound card, is impossible to set jack to run at 8 kHz. It is possible in some way, to fake the 8 kHz sampling frequency (for example using plugins?). I've seen the Steve Harris Decimator, but it is not designed to run in real time. I've tried to put in jack-rack a low-pass (antialias) filter followed by the SH Decimator, but the result is (as expected) a 44.1 kHz signal with reduced bandwith and some "aliasing" (I don't think that what I get is alias -by definition- but some other artifacts). What can I do to test my algorithm at 8 kHz in realtime using jack? Thank you all :) -- a.

10 years, 1 month

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Linux-audio-user