Linux-audio-user October 2011

linux-audio-user@lists.linuxaudio.org

130 participants
138 discussions

by Ralf Mardorf

On Wed, 2011-10-19 at 19:00 +0000, linux-audio-user-request(a)lists.linuxaudio.org wrote: > Message: 21 > Date: Wed, 19 Oct 2011 17:09:05 +0100 > From: Folderol <folderol(a)ukfsn.org> > Subject: Re: [LAU] Top DSP plugins? > To: linux-audio-user(a)lists.linuxaudio.org > Message-ID: <20111019170905.35d0425b@debian> > Content-Type: text/plain; charset=US-ASCII > > On Wed, 19 Oct 2011 08:39:32 +0200 > Jeremy Jongepier <autostatic(a)gmail.com> wrote: > > > On 10/18/2011 07:45 PM, S. Massy wrote: > > > - Finally, the only thing which seems to have been left out by > others is > > > the TAP scaling limiter which is great for final limiting if > handled > > > gently. > > > > > > > Oh yeah true! Most of the time the LADSPA Fast Look Ahead Limiter > is > > sitting in my Master bus. > > > > Best, > > > > Jeremy > > Forgot about that one! I use it quite a lot as a final 'haircut'. > Yoshimi can > produce some quite high random peaks, and judicious use of this can > often give > me an extra 3-4dB headroom. > > -- > Will J Godfrey If a special synth sound or e.g. an effect like a phaser should cause such peaks, I would use a compressor for the channel(s) not a limiter for the master bus. IMO a limiter can be used the way Fons was suggesting, to protect against a maximum credible accident and yes, than it should be used for the master bus. But my philosophy differs. Compress critical sound material for the channels, if needed. Good usage of EQs very often could help, so that there isn't the need to compress those signals. When we don't had computers and analog equipment was expensive, we need to find other solutions. Today there are some easy solutions, but we risk that this over-processing became audible. Again, the usage Fons was suggesting is uncritical, but using a limiter instead of a compressor, for often repeating peaks isn't good, since the limiter would cause distortion. 2 cents, Ralf

14 years, 3 months

Re: [LAU] Linux-audio-user Digest, Vol 56, Issue 25

by Ralf Mardorf

On Wed, 2011-10-19 at 19:00 +0000, linux-audio-user-request(a)lists.linuxaudio.org wrote: > Message: 7 > Date: Wed, 19 Oct 2011 09:11:52 -0400 > From: Brett McCoy <idragosani(a)gmail.com> > Subject: Re: [LAU] Top DSP plugins? > To: Colin Fletcher <colin.m.fletcher(a)googlemail.com> > Cc: linux-audio-user(a)lists.linuxaudio.org > Message-ID: > <CAPNMgw5eQkS6NBnGHtZw38VvgCjtJBdtm6 > +DBG6O6WgsyMe2Yw(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > On Wed, Oct 19, 2011 at 9:07 AM, Colin Fletcher > <colin.m.fletcher(a)googlemail.com> wrote: > > On 19/10/11 00:38, Ralf Mardorf wrote: > > > >> Jackconvolver is very good regarding to it's sound quality, but > AFAIK > >> there's no usable GUI for real-time control... > > > > Have you seen the "IR: LV2 Convolution Reverb" by Tom Szilagyi? > > (http://factorial.hu/plugins/lv2/ir). It's an LV2 wrapper for > > zita-convolver: it works well for me. > > Yes, it's been mentioned a couple of times. I LOVE the plugin and use > it extensively. It's great for mixing orchestral music. There is also > a standalone GUI for jconvolver called jcgui -- > http://jcgui.sourceforge.net/ Sometimes I'm using jcgui, but for example, one of the issue is, that it does use the same waveform for both stereo-channels. > >

14 years, 3 months

Re: [LAU] Linux-audio-user Digest, Vol 56, Issue 25

by Ralf Mardorf

On Wed, 2011-10-19 at 19:00 +0000, linux-audio-user-request(a)lists.linuxaudio.org wrote: > Message: 5 > Date: Wed, 19 Oct 2011 14:07:46 +0100 > From: Colin Fletcher <colin.m.fletcher(a)googlemail.com> > Subject: Re: [LAU] Top DSP plugins? > To: linux-audio-user(a)lists.linuxaudio.org > Message-ID: <4E9ECBA2.1010706(a)googlemail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 19/10/11 00:38, Ralf Mardorf wrote: > > > Jackconvolver is very good regarding to it's sound quality, but > AFAIK > > there's no usable GUI for real-time control... > > Have you seen the "IR: LV2 Convolution Reverb" by Tom Szilagyi? > (http://factorial.hu/plugins/lv2/ir). It's an LV2 wrapper for > zita-convolver: it works well for me. > > Colin. Wow, thank you Colin. I hope it ships with the bookmarked waveforms. Lexicon 480l, I mentioned it in my posting and I've forgotten to mention the PCM 70, I own some Yamaha SPX myself. The GUI does look promising. Cooooooooooooool :) Ralf

14 years, 3 months

Re: [LAU] Linux-audio-user Digest, Vol 56, Issue 24

by Ralf Mardorf

On Wed, 2011-10-19 at 12:00 +0000, linux-audio-user-request(a)lists.linuxaudio.org wrote: > Message: 19 > Date: Wed, 19 Oct 2011 11:23:09 +0200 > From: Jeremy Jongepier <jeremy(a)autostatic.com> > Subject: Re: [LAU] Top DSP plugins? > To: linux-audio-user(a)lists.linuxaudio.org > Message-ID: <4E9E96FD.8070908(a)autostatic.com> > Content-Type: text/plain; charset=ISO-8859-1 > > On 10/19/2011 10:52 AM, Ralf Mardorf wrote: > > +1, regarding to Jamin is good and it does work without pumping. > > I'm not so fond of JAMin. It has flaws and consumes way too much CPU. > About a year ago Patrick Shirkey mentioned that there was no other > JACK > application that attempts to provide a complete mastering chain. But > that was about a year ago, at the moment it is perfectly possible to > create a similar tool chain with the help of plug-ins. I prefer > plug-ins > then, more flexible. > > Best, > > Jeremy Yes, it does consume too much CPU resources. Do we have a similar three-band compressor? I don't need the limiter and the EQ. - Ralf > >

14 years, 3 months

[LAU] A new track made in Neil tracker

by Vytautas Jancauskas

http://soundcloud.com/orbitfold/every-blade-of-grass<http://soundcloud.com/orbitfold/every-blade-of-grass%5C> -- "Cheshire-Puss," she began, "would you tell me, please, which way I ought to go from here?" "That depends a good deal on where you want to get to," said the Cat. "I don't care much where--" said Alice. "Then it doesn't matter which way you go," said the Cat.

14 years, 3 months

[LAU] Alsa to jack bridge and asoundrc

by S. Massy

Hello, I've been trying to find a way to create an alsa to jack bridge. I found instructions at the following URL: http://alsa.opensrc.org/Jack_and_Loopback_device_as_Alsa-to-Jack_bridge I compiled the aloop module and it works fine, but when I try setting up the asoundrc as described, and use the device, I get. ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to open slave aplay: main:654: audio open error: Invalid argument Does anyone know what this uninformative error mean? Has anybody ever had luck with a similar setup? Thanks. Cheers, S.M. --

14 years, 3 months

[LAU] How bad is mp3/ogg

by Atte André Jensen

Hi I'm teaching a course in electronic music, and one of the subjects I'd like to cover is what compression does to the music. I googled a bit abd found this: http://www.youtube.com/watch?v=u5gdwpPrv_8 Basically it's a matter of loading the original + the mp3 encoded version of the same track, inverting the phase in one of the two clips and listening to the artifacts. I did some tests, and the results are scary. Lame (128 kbps)and oggenc (q=3) are different but both horrible, the artifacts are very ugly and distorted and are as loud as -19 dB!. My favorite mp3 encoder, gogo, has another strange result: The artifacts sound almost like the mp3, which should mean it changes the audio much more! However I don't really hear that much difference between lame and gogo encoded files... This got me thinking if this is even a realistic test. Assume for instance the encoder introduces a simple, constant delay in the encoded audio. This will result in a lot of sound slipping through the invert-the-phase-of-one-of-the-signals test. Although it could be said it alters the audio dramatically, when aligning the files and comparing them sample for sample, it has no impact on the perceived quality of the encoded audio. I didn't fiddle with delaying the gogo encoded file, though. My question is: is this really a fair way to judge the artifacts introduced by encoding? -- Atte http://atte.dk http://modlys.dk

14 years, 3 months

Re: [LAU] Top DSP plugins?

by Ralf Mardorf

> Message: 1 > Date: Tue, 18 Oct 2011 13:59:18 +0200 > From: "Jostein Chr. Andersen" <jostein(a)vait.se> > Subject: Re: [LAU] Top DSP plugins? > To: linux-audio-user(a)lists.linuxaudio.org > [snip] *Mainly Fons and LinuxDSP stuff [snip] REVERBS IMO are a weak point for any OS. If possible avoid using any Linux reverb, better use some stand alone 19" stuff. But if you need to use a Linux reverb the best choices are Jackconvolver for impulse response and LinuxDSP for an algorithm reverb. Jackconvolver is very good regarding to it's sound quality, but AFAIK there's no usable GUI for real-time control, while LinuxDSP has a usable GUI, but it still has limited abilities. Don't expect a Rev-1/7 or 480L or even a SPX 90 II. I suspect there are a lot of low cost reverbs, perhaps from Alesis, Behringer some other vendors and even Lexicon, that are easier to use than a Linux reverb. Perhaps the Arts reverb will run under wine, dunno, this VST anyway isn't that much better. If I wouldn't have a reverb, I would take a look at Alesis or Behringer, as long as I don't have the money for something better. 2 Cents, Ralf

14 years, 3 months

[LAU] Something New From Me

by Folderol

Developing my combined synth and guitar style. Please try not to fall asleep :) http://www.musically.me.uk/music/Starlight_Dancers.ogg or http://www.musically.me.uk/music/Starlight_Dancers.mp3 -- 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.

14 years, 3 months

[LAU] Another OT: Linux-audio-user Digest, Vol 56, Issue 23

by Ralf Mardorf

On Tue, 2011-10-18 at 22:56 +0000, linux-audio-user-request(a)lists.linuxaudio.org wrote: > Message: 22 > Date: Tue, 18 Oct 2011 21:10:19 +0100 > From: Harry van Haaren <harryhaaren(a)gmail.com> > Subject: Re: [LAU] Top DSP plugins? > To: f.rech(a)yahoo.fr > Cc: linux-audio-user(a)lists.linuxaudio.org > Message-ID: > <CAKudYbO7Vaheir9zJ2iDMvNx17M1Tzu2jtv7a2j71=VrQVp8GA(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > On Tue, Oct 18, 2011 at 6:08 PM, fred <f.rech(a)yahoo.fr> wrote: > > > it is that easy : tempo is maths !! http://en.wikipedia.org/wiki/Dyscalculia Some people are geniuses, still they could suffer from dyscalculia. 2 cents from a dyslexic :p, Ralf

14 years, 3 months

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Linux-audio-user October 2011