Linux-audio-user February 2012

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by NJCross

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12 years, 10 months

iPad and Linux audio

by Ralf Mardorf

Hi :) sorry for the cross posting. I'm interested if there's really an important usage for Linux (especially audio/MIDI), perhaps within the limits of a jailbreak, for an iPod. Someone from a Linux mailing list already sent me this links: > http://hexler.net/software/touchosc > http://liine.net/en/products/lemur/ I won an iPod 2 and I flirt with selling it and then to buy some Android thingy instead. I own a KORG nanoKONTROL, costs less than 3O €, so I won't keep an iPod for more than 600 €, providing not much more than the same features. To safe costs for ink cartridges an e-reader would be able to do the job. In wonder if there are really important realtime abilities provided by an iPod 2 that can be used with Linux. At the moment I'm using it with VirtualBox, running something very annoying, to use this tabled computer. Perhaps somebody has experiences with iPod vs Android?! Regards, Ralf

12 years, 10 months

Re: [LAU] Linux-audio-user Digest, Vol 60, Issue 24

by Ralf Mardorf

On Mon, 2012-02-20 at 12:00 +0000, linux-audio-user-request(a)lists.linuxaudio.org wrote: > Message: 14 > Date: Mon, 20 Feb 2012 12:21:20 +0100 (CET) > From: Julien Claassen <julien(a)mail.upb.de> > Subject: Re: [LAU] jack_disconnect on ports with spaces > To: Iain Mott <mott(a)reverberant.com> > Cc: linux-audio-user(a)lists.linuxaudio.org > Message-ID: <alpine.DEB.2.00.1202201220470.31852(a)flower.world.net> > Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII > > You're welcome. Everytime. So rare, that I can put down my tuppence > nowadays, > with all that GUI stuff around. :-) > Kind regards > Julien No GUI, but for some usage perhaps more comfortable is http://aj-snapshot.sourceforge.net/ quasi the successor of http://sourceforge.net/projects/heaven/files/Audio%20Applications/Jack% 20Related/jack_snapshot/ Regards, Ralf

12 years, 10 months

Re: [LAU] RME multiface pcmcia with pci adapter

by Ralf Mardorf

On Mon, 2012-02-20 at 12:00 +0000, linux-audio-user-request(a)lists.linuxaudio.org wrote: > Message: 2 > Date: Mon, 20 Feb 2012 09:44:27 +0100 > From: Emiliano Grilli <emiliano.grilli(a)gmail.com> > Subject: [LAU] RME multiface pcmcia with pci adapter > To: ML-LAU <linux-audio-user(a)lists.linuxaudio.org> > Message-ID: <87aa4dj3mc.fsf(a)emillo.net> > Content-Type: text/plain; charset=us-ascii > > > Hello, > > I just scored a RME multiface I + cardbus card on ebay for a good > price, > and I was wondering if that can be used with a pci to pcmcia adapter > like this one: > > http://www.ebay.it/itm/CONVERTITORE-DA-PCI-A-PCMCIA-ADATTATORE-UMTS-GPRS-WI… > > Anyone has used this kind of setup? > > Thank you in advance > I don't have experiences with such a setup. I would avoid using an adapter. Perhaps you should search the web for latency and jitter. I only read: http://www.rme-audio.de/forum/viewtopic.php?id=7521 They 're just talking about latency, not about jitter. An audio card is just an IO card, but OTOH we expect precision from pro-audio IO cards. Keeping in mind that even the combination of mobo, BIOS version and mounted hardware can cause issues, IMO an adapter could make the situation more critical. There perhaps is more to read: http://www.google.de/#sclient=psy-ab&hl=de&source=hp&q=pci+pcmcia +adapter+card+latencies&pbx=1&oq=pci+pcmcia+adapter+card +latencies&aq=f&aqi=&aql=&gs_sm=3&gs_upl=2178l7319l1l7498l21l18l0l3l3l1l182l2230l3.15l21l0&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=55c64d3a5dd0db77&biw=1152&bih=685 http://www.google.de/#sclient=psy-ab&hl=de&source=hp&q=pci+pcmcia +adapter+card+jitter&pbx=1&oq=pci+pcmcia+adapter+card +jitter&aq=f&aqi=&aql=&gs_sm=3&gs_upl=63588l64692l0l65172l7l7l0l0l0l0l144l912l0.7l7l0&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=55c64d3a5dd0db77&biw=1152&bih=685 IMO it's not a good idea. When I bought a RME card somebody from LAU or LAD mentioned that I should keep in mind that even PCI might be dropped soon. I reconsidered to get a PCI RME and bought a PCIe RME instead, knowing that it wasn't and still isn't that good supported as PCI models are. spinymouse@oz:~$ hdspconf HDSPConf 1.4 - Copyright (C) 2003 Thomas Charbonnel <thomas(a)undata.org> This program comes WITH ABSOLUTELY NO WARRANTY HDSPConf is free software, see the file copying for details Looking for HDSP cards : Card 0 : TerraTec EWX24/96 at 0xbf00, irq 20 Card 1 : TerraTec EWX24/96 at 0xbb00, irq 21 Card 2 : RME AIO S/N 0x579bcc at 0xfdef0000, irq 18 No Hammerfall DSP card found. 2 Cents, Ralf

12 years, 10 months

Re: [LAU] [LAD] Non Session Manager Preview

by Alexandre Prokoudine

On Mon, Feb 20, 2012 at 8:50 AM, J. Liles wrote: > Sometimes, I wonder why I even bother... First, recordmydesktop didn't work, > so I had to film the screen with a video camera Is there a particular reason you didn't use any of the gazillion of UIs and wrappers for FFmpeg that do exactly that? :) My personal fav is recordscreen. See http://www.davidrevoy.com/index.php?article65/ Alexandre Prokoudine http://libregraphicsworld.org

12 years, 10 months

RME multiface pcmcia with pci adapter

by Emiliano Grilli

Hello, I just scored a RME multiface I + cardbus card on ebay for a good price, and I was wondering if that can be used with a pci to pcmcia adapter like this one: http://www.ebay.it/itm/CONVERTITORE-DA-PCI-A-PCMCIA-ADATTATORE-UMTS-GPRS-WI… Anyone has used this kind of setup? Thank you in advance -- Emiliano Grilli Linux user #209089 http://www.emillo.net

12 years, 10 months

Hard drive for "/" should be also 7200 rpm?

by Yosef Werner

Hi all, for testing reasons I've installed Arch-Linux on a second HD with 5400 rpm. The recording and production is on the first HD with 7200 rpm, openSuSE 10.2 and kernel-rt. After some work with Arch-Linux it seems that it could be the next platform for the DAW. My question is if a HD-7200 rpm is also necessary for the system to prevent x-runs? For sure, the HD-7200 rpm is mounted for recording. Thanks for sharing your knowledge, Yosef

12 years, 10 months

OS for realtime operation

by Moshe Werner

Hi everyone, after many years of studio work using the openSuse distro with the kernel-rt from Jan Engelhard it seems that he no longer continues his great work on rt kernels. Being more on the recording engineer side of things and not a Linux expert (user yes, expert no) I really fret at the thought of patching and compiling my own kernel package. I would like to hear your opinions on what distro is solid for audio work and has a reliable rt kernel. Also I would appreciate if you could explain the degree of difficulty and learning curve of the specific distro. My system: Intel i7 950 Gigabyte motherboard 6 Gb ram Rme HDSP 9652 audio interface Appreciate your answers. Moshe P.S. I tried to use Ubuntu on the same machine I use openSuse 11.2 on and got pretty bad results regarding latency and x runs on jack 2.

12 years, 10 months

What audio interface to use for a Linux-powered surround preamp?

by Johan Herland

Hi, (TL;DR: skip to "The main question...") I'm planning a hobby project to build an all-digital surround/hi-fi system. Regular surround/hi-fi systems convert digital input sources to analog in the surround processor/preamp, but I want to keep the signal in the digital domain as far as possible (by using all-digital class D power amps, aka. "PowerDACs" [*] that convert a PCM signal to an amplified PWM signal that is feeds the speaker directly through an LPF. The heart of this system is an all-digital surround processor/preamp that should do the following: 1. Switch between multiple digital inputs. (typically from HDMI or SPDIF) 2. Decode and/or upsample the input (if necessary) into a suitable format, typically 96kHz or 192kHz 24-bit PCM in 8 channels (for a 7.1 system). 3. Perform signal processing on the PCM signal, like room correction and volume control. 4. Output each of the 8 channels on separate digital outputs suitable for connection to the power amp associated with each speaker. AFAIK there are currently (very few or) zero preamps for sale that meet the above requirements. Requirement #4 seems especially hard to satisfy. I'm therefore planning to build my own preamp based on the following components: - A HDMI switch with audio split (SPDIF) and RS-232 control. - A Linux computer that controls the HDMI switch, and contains the audio processing software (e.g. a gstreamer pipeline doing the decoding and manipulation). - A suitable audio interface with at least 8 digital outputs. I believe this rig should be able to meet the above requirements. The main question at this point is what audio interface I should choose for the rig. Some points to consider: - Must work very well with Linux; bonus points if the vendor is Linux-friendly. - Must be able to output 8 channels of 96kHz/24bit PCM, preferably using AES/EBU or SPDIF (as that's what most digital power amps seem to accept as input). - USB, Firewire, PCI or PCI express? Which is more stable/supported? - Bonus points if it also has 8 analog outputs, as I want to prototype this on an analog power amp before investing in digital power amps. - Since this is still in a proof-of-concept phase, I'd like to spend not more than about $1000 on the interface. So far I've been browsing interfaces like: - MOTU 828mk3 (capable, but seems to be poorly supported by Linux) - RME HDSPe AES (very capable, lacks analog outputs, a bit pricey) - RME Multiface II + HDSPe interface card (has analog outputs, not sure if 1 SPDIF plus 1 ADAT can give me 8 channels of digital output in 96/24, pricey) - Focusrite Saffire PRO 40 (seems similar to RME Multiface II, but cheaper. Unsure how well it is supported by Linux) What other audio interfaces should I check out? Are there other things I should keep in mind when picking an audio interface? Have fun! :) ...Johan [*]: Examples of all-digital power amps include the NAD Direct Digital amps (M2 and C390DD), the Tact True Digital Amplification series, etc. -- Johan Herland, <jherland(a)gmail.com> www.herland.net

12 years, 10 months

Timidity

by David Baron

Tmidity is a more than passable player, providing a decent GS subset. It can play other soundfonts/soudfonts-combinations (if I knew how to do it). Is there any interface to timidity that would enable editing sounds (like on other sampled synths)? Also, timidity is easily overloaded by controller events and while I have thinning programs for the final result, I could use something on the fly just for listening. (Eventually, the normal ALSA will be working correctly again and I will use my XG sound generator.)

12 years, 10 months

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Linux-audio-user February 2012