Linux-audio-user October 2007

linux-audio-user@lists.linuxaudio.org

147 participants
141 discussions

Which tool to sample 8 audio channel at the same time?

by Michelle Konzack

Hello, I am using Debian GNU/Linux (Unstable) on my multimedia machine with a M-Audio 1010LT and need to sample all 8 channels at the same time. Which tool can I use for it? I have tried Audacity but it does not work. Note: I need the eight audiotrack in the same project and I must work on them like in Audacity where I have all tracks togehther. Thanks, Greetings and nice Day Michelle Konzack Tamay Dogan Network -- Linux-User #280138 with the Linux Counter, http://counter.li.org/ ##################### Debian GNU/Linux Consultant ##################### Michelle Konzack Apt. 917 ICQ #328449886 50, rue de Soultz MSN LinuxMichi 0033/6/61925193 67100 Strasbourg/France IRC #Debian (irc.icq.com)

17 years, 8 months

RME PCI host and Multiface problems

by Svend-Erik Kjær Madsen

Hi I've just installed a RME HDSP PCI card and connected a Steinberg Nuendo box "Multiface" but when i try to load the firmware i get following: hdsploader - firmware loader for RME Hammerfall DSP cards Looking for HDSP + Multiface or Digiface cards: Card 0 : RME Hammerfall DSP at 0xdd000000, irq 3 Upload firmware for card hw:0 Hwdep ioctl error on card hw:0 : Input/output error. Can it be caused by to long cables "my cable is round 4,5 meters" and HOST indicator lights red ? /Sv-e

17 years, 8 months

foot switch for pausing/playing audio signals for better transcribing

by N. Gey

Hello list, The situation is that I often transcribe audio signals (music of course, but also spoken words like interviews) to my computer. Its a good situation when your hands are free so you can use both hands to write. I recently read about some expensive usb-footcontroller (USB) which somehow connects to an audio program to send start/stop signals. This cant be this complicated... there a plenty of midi controllers out there which you controll with your food, even the sustain-pedal is suitable for the start/stop job. Do you have any Idea or know of anything which do the described? Just sending a signal to a audioprogramm (audacious, audacity, xmms etc.) to halt? greetings, Nils

17 years, 8 months

Source for glitchy drums?

by Ken Restivo

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I'm starting to enjoy glitchy percussion sounds I'm hearing in a lot of computer music these days, and want to experiment with those. I've asked around about how people are making these sounds, and the answers I get are "Battery", "Redrum", and "Reason". All firmly wedged closed and proprietary. of course. Are there any good free tools for making glitchy drum sounds, which do not require the use of WINE? If the answer to that is "SC/CSound/PD/ChucK", that's fantastic, can anyone point me to some particularly good source code or patches for glitchy drums in those languages that I could start experimenting with? Thanks. - -ken -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFGfDuGe8HF+6xeOIcRAnvoAKCN2WA/VKIuYEvAQHUoOc7vWMZTEQCfZpDX /io2wdQSjVhPudrTM+ZEYYk= =us4I -----END PGP SIGNATURE-----

17 years, 8 months

SOLUTION: phasex and bpm settings

by Ken Restivo

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I experienced a strange problem in PHASEX where the BPM settings were saved in a patch file, but, when the file loaded, the BPM settings wouldn't. The problem was that I had the "lock parameter" box checked in the MIDI map for that parameter (BPM). I don't remember if I set that, or if it is the default. When "lock parameter" is set, not only will PHASEX ignore any updates from MIDI for that parameter, but also from the patch files. This could be kind of a useful feature, i.e. when playing a song and switching patches, often you don't want the BPM of the delay changing unexpectedly, just because you changed a patch. However, when saving patches that go with a particular song project, you definitely *do* want the BPM to change when you load the patch. So I unchecked this, and I save that unchecked MIDI map with every project, so that the patch will load and have the correct BPM. Saving MIDI maps along with the project is also a good habit to get into. It sucks to open a sequence and load a patch and the MIDI maps you'd recorded no longer do anything. - -ken -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHIAO7e8HF+6xeOIcRAj2cAKCTK2FjAtHbJnEliavsjt0pWjyRywCgo+HR O7xUdyyjwSntkxBHarOzSd4= =Gb5z -----END PGP SIGNATURE-----

17 years, 8 months

Capturing ALSA

by leslie.polzer＠gmx.net

I'm sure there must be a way to capture audio being played via ALSA. Can anyone tell me how? Leslie -- Personal homepage: https://viridian.dnsalias.net/~sky/homepage/ gpg --keyserver pgp.mit.edu --recv-keys DD4EBF83

17 years, 8 months

Re: [LAU] USB device gives wrong data?

by william estrada

Fons, Thanks for your reply. Yes, the format is U8, it is a simple recording program to make '.wav' files. The filtering does work when adjusting the 'silence byte'. It appears that the device drivers are not consistent with this value? So I will be adding an option to change the value of the 'silence byte'. How do I use the RMS value to remove noise? A URL that I could read? Thanks again for your time. -- William Estrada MrUmunhum(a)popdial.com Mt-Umunhum-Wireless.net ( http://Mt-Umunhum-Wireless.net ) Ymessenger: MrUmunhum > Message: 6 Date: Mon, 22 Oct 2007 08:53:34 +0200 From: Fons Adriaensen > <fons(a)kokkinizita.net> Subject: Re: [LAU] USB device gives wrong data? To: > linux-audio-user(a)lists.linuxaudio.org Message-ID: > <20071022065334.GB5840(a)linux-2.site> Content-Type: text/plain; > charset=us-ascii On Fri, Oct 19, 2007 at 02:44:08PM -0700, william estrada > wrote: >>> When I use my laptop's sound device and record without a mic, I get a >>> file full of x'7f's. If I do the same with my cheap-o USB device I get a >>> file full of x'81's. The sound quality from the laptop is unacceptable, >>> so that is way I want to use the USB device. > > Those values are somewhat confusing - your device doesn't produce 8-bit > samples, does it ? > > A 'perfect' interface would probably produce zeros on silence. You may be > seeing a small DC offset. > > Anyway, silence detection based on one particular sample value can't be > expected to work well, there will always be _some_ noise. Better calculate > the RMS amplitude and set a threshold on that. > > -- FA Laboratorio di Acustica ed Elettroacustica Parma, Italia Lascia la > spina, cogli la rosa.

17 years, 8 months

ID3/Ogg metadata copying?

by Ken Restivo

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I need to write a small script to read all the metadata from a bunch of ogg files and save the exact same metadata into a bunch of corresponsing mp3 files of various bitrates. I'd like to have this in either python or bash. It seems there are about a dozen different competing tools and python libraries which may or may not be able to do this. If anyone can recommend one that will definitely do this, it would save me many hours of installing every possible option out there before finding the one that works. Thanks! - -ken -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHH9Gce8HF+6xeOIcRAjdBAJwLoJMXpQA5y6xkE1EmSUQTta+1OQCg8dgg JwccZvLSRHSUxJ8MeZt5InY= =o7hG -----END PGP SIGNATURE-----

17 years, 8 months

Re: [LAU] [alsa-devel] USB device gives wrong data?

by william estrada

Now that is helpfull. Thanks, I will try it when I get a chance. Thanks Gordon. William Estrada MrUmunhum(a)popdial.com Mt-Umunhum-Wireless.net ( http://Mt-Umunhum-Wireless.net ) Ymessenger: MrUmunhum > Message: 1 > Date: Wed, 24 Oct 2007 11:05:35 +0100 > From: Gordon JC Pearce <gordonjcp(a)gjcp.net> > Subject: Re: [LAU] [alsa-devel] USB device gives wrong data? > To: linux-audio-user(a)lists.linuxaudio.org > Message-ID: <200710241105.35908.gordonjcp(a)gjcp.net> > Content-Type: text/plain; charset="iso-8859-1" > > On Tuesday 23 October 2007 00:05:13 James Cameron wrote: > >>> How would you filter out noise? >> You can filter out DC offset by measuring the offset you have, and >> subtracting this measurement from your samples. > > A better way would be to use a highpass filter. > > Use something like: > > > for (i=0; i<=NUM_SAMPLES; i++) { > hp_last = 0.9999f * hp_last + in[i] - hp_last_in; > hp_last_in = in[i]; > out[i] = hp_last; > } > > You could optimise that a bit. > > Gordon > >

17 years, 8 months

Suggested distro and processor speed ?

by kevin kelley

Hello, This is my first post. I work everyday with Linux at my job (Slackware). I was wondering what most of the people on this list use as their main Distro for Linux audio? I plan to use some form of multitrack recording software as well as some sampling looping software as well. I have some older boxes that I was considering using does anyone have advice on processor speed and system configurations that work well? I am also interested in knowing what hardware interface work best for Linux audio? Sorry for the fragmented post. Kevin Kelley xirin6(a)yahoo.com __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

17 years, 8 months

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Linux-audio-user October 2007