Linux-audio-user October 2002

linux-audio-user@lists.linuxaudio.org

83 participants
67 discussions

by kasper＠303.nu

Hi, >From the JACK FAQ: "aRts, a streaming media architecture: aRts was not designed from the ground up with low-latency in mind. Not a fault, but a design decision. A jack output element could be written for aRts, though, as far as I can tell." Anybody tried this already? If not, I would like to spend some time creating an aRts output element, because my laptop soundchip doesn't have decent ALSA drivers. And it seems easier to write a jack output for aRts than to debug the es18xx ALSA drivers. greetz, Kasper

21 years, 6 months

[linux-audio-user] Announcing initial release of FreqTweak

by Jesse Chappell

Announcing the initial release of FreqTweak (v0.4) http://freqtweak.sourceforge.net FreqTweak is a tool for FFT-based realtime audio spectral manipulation and display. It provides several algorithms for processing audio data in the frequency domain and a highly interactive GUI to manipulate the associated filters for each. It also provides high-resolution spectral displays in the form of scrolling- raster spectragrams and energy vs frequency plots displaying both pre- and post-processed spectra. It currently relies on JACK for low latency audio interconnection and delivery. Thus, it is only supported on Linux. FreqTweak is an extremely addictive audio toy, I have to pry myself away from playing with it so I can work on it! I hope it has value for serious audio work too (sound design, etc). The spectrum analysis is pretty useful in its own right. FreqTweak supports manipulating the spectral filters at several frequency resolutions (64,128,256,512,1024, or 2048 bands) depending on your needs and resources. Overlap and windowing are also selectable. The GUI filter graph manipulators (and analysis plots) have selectable frequency scale types: 1x and 2x linear, and two log scales to help with modulating the musical frequencies. Filters can be linked across multiple channels. The plots are resizable and zoomable (y-axis) to allow precise editing of filter values. The current processing filters are described below in the order audio is processed in the chain. Any or all of the filters can be bypassed. The state of all filters can be stored or loaded as presets. Spectral Analysis -- Multicolor scrolling-raster spectragram, or energy vs. freq line or bar plots... one shows pre-processed, another shows post-processed. EQ -- Your basic multi-band frequency attenuation. But you get an unhealthy number of bands... Pitch Scaling -- This is an interesting application of Sprengler's pitch scaling algorithm (used in Steve Harris' LADSPA plugin). If you keep all the bins at the same scale, it is equivalent to Steve's plugin, but when you start applying different scales per frequency bin, things quickly get weird. Gate -- This is a double filter where a given frequency band is allowed to pass through (unaltered) if the power on that band is between two dB thresholds... otherwise its gain is clamped to 0. Delay -- This lets you delay the audio on a per frequency-bin basis yielding some pretty wild effects (or subtle, if you are careful). A feedback filter controls the feedback of the delay per bin (be careful with this one). This is basically what Native Instrument's Spektral-Delay accomplishes. Granted, I don't have all the automated filter modulations (yet ;). See their website for audio examples of what is possible with this cool effect. Have fun... report bugs... Jesse Chappell <jesse(a)essej.net>

21 years, 6 months

[linux-audio-user] Re: [linux-audio-announce] Announcing initial release of FreqTweak

by Jesse Chappell

OK, here is a patch to fix that... new sourceforge file release is on its way soon. cd freqtweak-0.4 patch -p0 < /path/to/portsel.diff jlc > On Sun, 13 Oct 2002, Jesse Chappell wrote: > >> Announcing the initial release of FreqTweak (v0.4) >> >> http://freqtweak.sourceforge.net >> > > Hello, I get the following: > > g++ -DHAVE_CONFIG_H -I. -I. -I.. -I/usr/local/include > -I/usr/lib/wx/include/gtk-2.2 -DGTK_NO_CHECK_CASTS -D__WXGTK__ > -D_REENTRANT -DNEWWX -I/usr/local/include -g -Wall -O3 > -fomit-frame-pointer -fstrength-reduce -funroll-loops -fmove-all-movables > -ffast-math -mcpu=i686 -march=i686 -c FTportSelectionDialog.cpp > FTportSelectionDialog.cpp: In method `void > FTportSelectionDialog::update ()': > FTportSelectionDialog.cpp:118: no matching function for call to > `wxListBox::DeselectAll ()' > FTportSelectionDialog.cpp: In method `void > FTportSelectionDialog::OnDeselectAll (wxCommandEvent &)': > FTportSelectionDialog.cpp:156: no matching function for call to > `wxListBox::DeselectAll ()' > > wx is 2.2.9 > > Regards, > Reiner

21 years, 6 months

Re: [linux-audio-user] Easy question about a single app workstation

by linuxmedia4＠netscape.net

WLCraig <wendell1(a)anncrman.com> wrote: >> When I first started out using Linux, I used fvwm2. It used >> very little resources and booted up very quickly. I still >> have it on the SuSE 6.4 install, so it may still be out >> there somewhere. >> >> Rocco > I use fvwm2 all day every day; ready to go in approx > .75 seconds. Does everything I want a wm to do. No bells. > No whistles. Perfect! You said *exactly* what I (originally) wanted to say about fvwm2. It's just that I have only used kde and fvwm2 and wasn't sure what the others were like. But yes... loads fast as %&*# and used (if my memory serves me well) 1 or 2 megs of ram. Am I mistaken about the 1 or 2 megs of ram part? Rocco __________________________________________________________________ The NEW Netscape 7.0 browser is now available. Upgrade now! http://channels.netscape.com/ns/browsers/download.jsp Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/

21 years, 6 months

[linux-audio-user] powerpc audio distorted unless volume very low

by Matthew Yee-King

Hello I've just got my powerbook back after it took 3 weeks to replace the screen. The repair shop was kind enough to blow away my hard drive and install macos 9.1 so i'm now rebuilding my linux system. I've gone for yellow dog 2.3 (after the debian installer gave me too much gip). Preamble over, heres the griff: I've got kernel version 2.4.19-4a i'm running alsa 0.9rc2 / snd-powermac (rc3 wouldn't build the powermac driver) Some apps work fine, e.g. xmms playing an mp3 (oss emulation) pd 0.35 (native alsa) Others have a very distorted sound unless the software volume level is very low, e.g. audacity (oss emu) SpiralSynthModular (oss emu) 1. has anyone else using ppc noticed this phenomenon of some apps being fine and others being very distorted? 2. does anyone have a good solution? i had the same problem with my previous install on this machine when i had alsa/ benh2.4.19 kernel. the solution i found was to use the 2.4.10 yellow dog kernel + oss native module when running these audio apps. unfortunately this did not allow me to use alsa. cheers matthew

21 years, 6 months

Re: [linux-audio-user] Easy question about a single app workstation

by linuxmedia4＠netscape.net

>>> Andy Main hat gesagt: // Andy Main wrote: >>> ...how would I go about booting directly into ardour? >>> Ie no logins, no fancy window manager just switch on >>> the pc and it boot into it... >> Frank Barknecht wrote: >> I think, without a window manager Ardour would >> be nearly useless... > ...Another thing to consider is using ressource > friendly applications. Make something like sWM > (www.small-window-manager.de) or at least blackbox > your window manager, use Vim not Emacs, Dillo not Mozilla, > M. Eddington's minibar not the Gnome/KDE-Panel, mc not > Nautilus and so on. >This way, you could get the most out of your (minimalist) machine. When I first started out using Linux, I used fvwm2. It used very little resources and booted up very quickly. I still have it on the SuSE 6.4 install, so it may still be out there somewhere. Rocco __________________________________________________________________ The NEW Netscape 7.0 browser is now available. Upgrade now! http://channels.netscape.com/ns/browsers/download.jsp Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/

21 years, 6 months

[linux-audio-user] How do you make an ogg?

by Laura Conrad

A technical but mostly non-linux friend was asking me about where Ogg Vorbis is relative to MP3's, given the current status of MP3 encoding software. I did a quick test of making an ogg from a wav, and my naive version produced: [lconrad@tuba renfaire]$ ls -l hercules* -rw-rw-r-- 1 lconrad lconrad 4526080 Aug 18 14:14 hercules2.mp3 -rw-rw-r-- 1 lconrad lconrad 12220015 Sep 3 12:30 hercules2.ogg -rw-rw-r-- 1 lconrad lconrad 49956104 Aug 18 14:09 hercules2.wav I used ecasound to do the encoding, but what my ecasoundrc says it did is: ext-ogg-output-cmd = oggenc --raw -o %f oggenc is: [lconrad@tuba renfaire]$ oggenc -v OggEnc v0.8 (libvorbis rc2) So my question is, is there a way to get the ogg file down closer to the size of the mp3 file? -- Laura (mailto:lconrad@laymusic.org , http://www.laymusic.org/ ) (617) 661-8097 fax: (801) 365-6574 233 Broadway, Cambridge, MA 02139

21 years, 6 months

Re: [linux-audio-user] Easy question about a single app workstation

by linuxmedia4＠netscape.net

>> WLCraig <wendell1(a)anncrman.com> wrote: >> >> I use fvwm2 all day every day; ready to go in approx >> .75 seconds. Does everything I want a wm to do. No bells. >> No whistles. Perfect! > Rocco <linuxmedia4(a)netscape.net> wrote: > You said *exactly* what I (originally) wanted to say about > fvwm2.... Rocco <linuxmedia4(a)netscape.net> wrote: Oh yea... I forget to mention... The reason it would be good for a dedicated PC Music Workstation is that (even though) you can strip fvwm2 down to just the grey mesh background, you can still have tons of functionality. If you left click on the backdrop, you get the (user defined) pop-up menu with all your favorite scipts, programs, utilities. And if you right click, you get a pop-up menu of all programs that are currently running (click on one to go to that program). Imagine your multitrack recorder on one desktop, then you activate the pop-up menu and choose the mixer to go to your mixer. And that's why you dont need a task bar. Just move from modual to module without pesky task bars, panals or icons lying around taking up valuable space and resources. You can have icons in the pop-up menu if you want to make this more intuitive. Rocco __________________________________________________________________ The NEW Netscape 7.0 browser is now available. Upgrade now! http://channels.netscape.com/ns/browsers/download.jsp Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/

21 years, 6 months

[linux-audio-user] Advice for new users?

by Sage

Hello, everyone, I'm new to the list, and to linux audio in general. I tried Linux on my desktop about a year ago, but found it so frustrating that I gave up after a few weeks and reinstalled Windows. But now that Red Hat 8 is out, I'm anxious to try again. The only problem is, I don't know what kind of audio production applications are able to provide me with the functionality that I've been enjoying in Windows with Cubase SX. I have a small home studio with hardware that is fully Linux compatible (bless you, M-Audio). I know Ardour seems to be the best choice for multitrack recording, and I'm sure it would suffice since my plugin needs are limited. Unfortunately, I rely heavily on midi and synth plugins (in my current case, Cubase's VST Instruments) to handle various keyboards. I don't do loops or anything particularly complicated. I just have a simple midi controller that I use to record keyboard tracks. I'd like to hear some suggestions as to what software someone like me could use to retain the same basic functionality when switching to Linux. Does anybody have any suggestions? If people are in general agreement as to what the "best" apps out there are, it might be useful to have a webpage dedicated to recommendations from the list, eh? Just a thought. :) Thanks, everyone. I look forward to hearing your opinions! Sage

21 years, 6 months

[linux-audio-user] Easy question about a single app workstation

by Andy Main

This is my first post on this list, so here goes!...... I've had ardour running on my system for a while now and I really like it. I've now got hold of a second PC which I am gonna dedicate to running only ardour (on a debian system). Now once I have all set up and working well, how would I go about booting directly into ardour? Ie no logins, no fancy window manager just switch on the pc and it boot into it (and mount some drives on a network). I'd for obvious reasons have a dual boot config in order to debug and apt update ;) Thanks for any help given. Andy.

21 years, 6 months

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Linux-audio-user October 2002