Linux-audio-user October 2011

linux-audio-user@lists.linuxaudio.org

130 participants
138 discussions

Some heavy stuff and some weird stuff made with linux

by Arve Barsnes

Probably not the greatest display of what you can do with a linux box this, but we just released two albums and an ep yesterday. The albums are grindcore of the short variety (both albums are 19 songs in just above 2 minutes), but the ep (The Piece.....) is a simple acoustic song in 5/4 with some weird stuff on top. Even managed to use zita-at1 in there. It'll only take you 7 minutes to listen to all the three releases, so take a listen to the band that only exists because we thought it was funny that noone had ever used this word in a bandname before ;p http://constipation.bandcamp.com Regards, Arve

13 years, 1 month

small/cheap devices that can run jackd?

by Alessandro Preziosi (licnep)

Does anybody have any idea for a device (smartphone/tablet/netbook/mini-pc...) that could run jackd and thus be used as an effects processor or synth module? I really don't know where to look, but the idea intrigues me. It should probably be something with a usb port, in order to connect midi stuff or an external audio card. Any idea?

13 years, 2 months

Open Sound Interface project beginnings

by Charles Henry

Hi, list I'm interested in getting feedback for a project, namely building an audio interface, with the goal of creating freely available schematics and code required. Hence, an Open Sound Interface. Once I've heard from all those interested, we may want to migrate the discussion to another development oriented list such as the linux-audio-dev list to work out nitty-gritty technical details. For now, it's enough just to gauge interest and deal with planning issues. The concept is to create a modular and scalable system that allows users to create a sound interface with an arbitrary number of input/output channels. Goals of the system: 1. low latency 2. isolate design considerations 3. abstraction of data transport types 4. flexibility of adc/dac/preamp combinations 5. no unnecessary features--keep it lean; niche features can be added in by those interested My idea for how to do it, and components/tasks to design: 1. Modules for dac and adc with on-board identifiers (mixed-signal design) 2. A FPGA-based programmable system board with connectors for respective modules (high-frequency circuit design) 3. FPGA code for buffers, clocks, and device discovery (VHDL/Verilog programming) 4. Data transport modules (FPGA code plus hardware design), could be USB, FW, ETH, PCI, wireless, etc... 5. Kernel modules for each type of transport (software design) 6. Power supplies (not especially difficult, but tough to find off-the-shelf components to meet specs) What I'm doing: studying VHDL coding and preparing to test I2C/SPI dacs on a Digilent Basys-2 board with breadboards (maybe over a few months) studying high frequency electronics design This sort of problem would take a good team to do well. There's room for many levels of software/hardware expertise, especially those who understand linux audio kernel modules (design for many parts of the system depend on capabilities to design for). It may be a chore, but some kind of organization and design documents will be needed. All the components are inter-related: it takes a combination of top-down (whole system) and bottom-up (per module) considerations to build a complete design. Any feedback, insights, practical considerations, and reasonable expectations for taking a complex project like this to completion would be welcome. Thanks, Chuck

13 years, 2 months

Explodomatica - explosion sound effect generator

by Stephen Cameron

I made a little explosion sound effect generator, the idea being to help out people looking for such things for making video games, and so on. It relies on portaudio, libsndfile, and gtk2. I don't really know what I'm doing when it comes to DSP, so probably some of you will laugh when you see my algorithms. But it does more or less make explosion sounds. It's here: http://smcameron.github.com/explodomatica Enjoy -- steve

13 years, 2 months

Watch out for testers

by hermann

Hi The guitarix project could need your help. :-) After a complete source restructure, to become a real object orientated source struct, nearly every line have rewritten (by Andreas Degert). Now, we need to know, if there are any hidden bugs slips in during this process. We would push out a new release soon, to cover the new release of zita-convolver, but we could need some feedback from users of different arch and distro, to fix possible remaining bug's before. So, if you like to help us, check out our SVN, let us know if you run into a problem or if anything works well for you. Let us know your arch and distro, . . Help us to bring a usable Guitar Tube Amp emulation to the Free Software World. Our SVN: svn co http://guitarix.svn.sourceforge.net/svnroot/guitarix/trunk guitarix our tracker: http://sourceforge.net/tracker/?group_id=236234 your feedback will be welcome here or there or anywhere. :-)) or in our forum: http://sourceforge.net/apps/phpbb/guitarix/ so please, don't be shy and tell us your test results. regards hermann

13 years, 2 months

Re: [LAU] OT: What battery powered Amps are you using?

by Ralf Mardorf

On Sun, 2011-10-30 at 12:00 +0000, linux-audio-user-request(a)lists.linuxaudio.org wrote: > Message: 3 > Date: Sat, 29 Oct 2011 11:34:10 -0500 > From: Stephen Stubbs <theother1510(a)sbcglobal.net> > Subject: [LAU] OT: What battery powered Amps are you using? > To: linux-audio-user(a)lists.linuxaudio.org > Message-ID: <4EAC2B02.4060205(a)sbcglobal.net> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > 10/29/2011 > > Hello All, > > What small, battery/electric powered, portable Amps are you using? > > I'm taking up the Autoharp (an acoustic instrument) that has a > magnetic > pickup with 1/4" jack output. I have a Zoom H2 recorder that I would > use as a vocal microphone (has the 1/8" mini-stereo line output). > > I'm not interested in special guitar effects. A graphic equalizer is > a > plus. > > The Vox Mini 3 looks promising. I could run the Autoharp 1/4" out > through the Vox 1/4" input jack. The Zoom H2 line out into the Vox > Aux > In jack. Will this work? > > And do any of these Amps have a Line Out that I could run to my > Yamaha > MG10/2 mixer? That would be very nice for recording. > > Other suggestions? > > Thanks All, > Stephen. If you know how to solder build your own amp. I suspect that those battery powered amps don't have any special characteristics comparable to those of big amps. Resp. if there are low cost battery amps, I would test the cheapest. A review in German says that the amp should be ok, if you need amp simulation. http://www.musiker-board.de/reviews-e-git/403506-amp-vox-mini-3-a.html I suspect that if you need all the features you can't build an amp yourself for that price. Since you don't need it, why paying that much money? - Ralf > >

13 years, 2 months

OT: What battery powered Amps are you using?

by Stephen Stubbs

10/29/2011 Hello All, What small, battery/electric powered, portable Amps are you using? I'm taking up the Autoharp (an acoustic instrument) that has a magnetic pickup with 1/4" jack output. I have a Zoom H2 recorder that I would use as a vocal microphone (has the 1/8" mini-stereo line output). I'm not interested in special guitar effects. A graphic equalizer is a plus. The Vox Mini 3 looks promising. I could run the Autoharp 1/4" out through the Vox 1/4" input jack. The Zoom H2 line out into the Vox Aux In jack. Will this work? And do any of these Amps have a Line Out that I could run to my Yamaha MG10/2 mixer? That would be very nice for recording. Other suggestions? Thanks All, Stephen.

13 years, 2 months

Re: [LAU] Open Sound Interface project beginnings

by Christoph Kuhr

>> A suggestion: start with providing just digital interfaces: ADAT, and >> MADI if you're ambitious. Both are quite straightforward. ... >> I wouldn't forget poor old AES (including SPDIF.) How about a standard adc stage with FPGA processing/routing and I2S bus. For ADAT there are already the OPTOGEN and OPTOREC modules (dont have the links right now). Then ADAT and spdiff/aes-ebu as standard interfaces. An optional XMOS low cost board for avb, which is capable of I2S. And a FPGA extension board for MADI and ieee1394 also connected via I2S. I kinda like the idea... could be highly flexible... Second step: same device as DAC... Sorry fucked up the subject... Ck

13 years, 2 months

Re: [LAU] Linux-audio-user Digest, Vol 56, Issue 40

by Christoph Kuhr

13 years, 2 months

OT - Digital Rights

by Kevin Cosgrove

I went to a talk many months back on the IEEE working group P1817 sometime standard aimed at helping people to be able to treat their digital property more like they treat their physical property. For example, you can loan someone a CD or DVD, and then they give it back or you don't loan stuff to them again. Why shouldn't that work for an electronic copy? Why shouldn't you be able to sell your e-book when your done with it? How should a library deal with loaning of e-books? How about loaning an e-book over the net? Anyway, it was pretty interesting stuff to me. I thought there might be an interest in this, given recent discussions here. Here's a blurb on it. http://grouper.ieee.org/groups/1817/pub_docs/ORtalk_final_posted.pdf It's not perfect, but anything that helps get commerce in digital goods flowing in a more sane manner is nice to me. Cheerio... -- Kevin

13 years, 2 months

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Linux-audio-user October 2011