Linux-audio-user March 2007

linux-audio-user@lists.linuxaudio.org

183 participants
203 discussions

Fw: [linux-audio-user] Peak Level Monitor/Limiting

by Folderol

Begin forwarded message: Date: Fri, 30 Mar 2007 21:50:52 +0100 From: Folderol <folderol(a)ukfsn.org> To: linux-audio-user(a)lists.linuxaudio.org Subject: Re: [linux-audio-user] Peak Level Monitor/Limiting On Thu, 29 Mar 2007 16:01:12 -0400 "Lee Revell" <rlrevell(a)joe-job.com> wrote: > On 3/29/07, Folderol <folderol(a)ukfsn.org> wrote: > > Can anyone suggest a way I can effectively suppress these peaks while > > actually recording (rather than going back later, checking, then > > re-recording) or is there a VU type metering program that can be tacked > > on to jack? > > meterbridge Thanks. This looks pretty good. -- Will J G -- Will J G

17 years, 1 month

Fw: [linux-audio-user] Peak Level Monitor/Limiting

by Folderol

Begin forwarded message: Date: Fri, 30 Mar 2007 21:50:12 +0100 From: Folderol <folderol(a)ukfsn.org> To: linux-audio-user(a)lists.linuxaudio.org Subject: Re: [linux-audio-user] Peak Level Monitor/Limiting On Thu, 29 Mar 2007 23:16:31 +0200 "Arnold Krille" <arnold.krille(a)gmail.com> wrote: > 2007/3/29, Folderol <folderol(a)ukfsn.org>: > > As many of you will know I principally use ZynAddSubFX to generate most > > of my sounds, so I can't really be sure if this is a Zyn problem or a > > general one with software synths and mixing. > > Very occasionally I get high amplitude spikes typically 6dB above the > > 'normal' peaks. These give a false idea of the signal level so that if > > I'm not watchful I end up recording at a much lower level that I need > > to. > > Whats the problem with recording at lower volume? As long as there is > no da/ad involved you won't have any quality-loss. > > But I prefer to work with hot-signals too. ;-) > > Arnold Because I retain the 'source' files, it makes sense for me to produce a final wav format recording that complements all the others in apparent volume, so that I can cut a CD directly in any mix of my music without having to worry about unmatched levels. -- Will J G -- Will J G

17 years, 1 month

[linux-audio-user] amt unitor midicombo under alsa

by Malte Steiner

Hello, the last hurdle of complete transition from a Mac based studio to a Linux one is to get the multiple Midiinterfaces running. I have an old Emagic AMT8 connected to the computer via USB which is cascaded to an even older Unitor. The AMT8 channels are visible but no further ones. Has anyone similar rig? If this not work, what are current options of 8x8 midi interfaces? The market seems empty. I guess getting another AMT8 from evilbay is the option, or? Someone on this list gave some hints with the virt-midi module but I couldnt get this to work because the cascaded interface is not showing up anywhere. Unitors cant be connected directly to the computer because they have no USB. Cheers, Malte -- Malte Steiner media art + development -www.block4.com-

17 years, 1 month

[linux-audio-user] RE: [linux-audio-dev] promoting LAC 2007

by Ivica Ico Bukvic

> We are, as we have been always, quite on our own in this little pocket > universe of ours. I think this issue is amplified by the fact that the conference also targets by and large the same crowd. I am also not convinced that we would not be able to find some software allies provided we begin catering to more diverse audience... Linuxaudio.org consortium already has several high-profile pro audio members. Stay tuned for more updates in the coming weeks. This summer may introduce hopefully some cool additions to the Linuxaudio.org. Ico

17 years, 1 month

[linux-audio-user] Peak Level Monitor/Limiting

by Folderol

As many of you will know I principally use ZynAddSubFX to generate most of my sounds, so I can't really be sure if this is a Zyn problem or a general one with software synths and mixing. Very occasionally I get high amplitude spikes typically 6dB above the 'normal' peaks. These give a false idea of the signal level so that if I'm not watchful I end up recording at a much lower level that I need to. I have found that if I let these peaks go into limiting, there is no detectable audio effect, and displaying the waveform very stretched in Audacity shows just these occasional spikes neatly clipped. Can anyone suggest a way I can effectively suppress these peaks while actually recording (rather than going back later, checking, then re-recording) or is there a VU type metering program that can be tacked on to jack? -- Will J G

17 years, 1 month

[linux-audio-user] [ANN] List migration on the 1st of april

by Marc-Olivier Barre

Dear members, I am proud to announce that we will proceed with the list migration during the night between the 31st March and the 1st April (at 0h00 GMT). >From this point on, emails should be sent to these addresses : - linux-audio-dev(a)lists.linuxaudio.org for the developper mailing list - linux-audio-user(a)lists.linuxaudio.org for the user mailing list - linux-audio-announce(a)lists.linuxaudio.org for the announce mailing list The following aliases have been defined, to make it look nicer. Consider them as shorter equivalents : - lad(a)lists.linuxaudio.org for the developer mailing list - lau(a)lists.linuxaudio.org for the user mailing list No alias for the announce list since it is an open list (non subscribers are allowed to post) and we fear a increase in spam with a too short name. Also, to respond to a request to a few of you working with command line mail clients, the list tag at the beginning of the subject line will be shortened : [LAD] for linux-audio-dev [LAU] for linux-audio-user [LAA] for linux-audio-announce You may need to update your email filters accordingly. Those of you posting on the old addresses will get a message providing you with the new email to use. __________________ Marc-Olivier Barre, Markinoko.

17 years, 1 month

Re: [linux-audio-user] Peak Level Monitor/Limiting[Fwd: linux-audio-user Digest, Vol 42, Issue 125]

by Phil Mendelsohn

Message: 5 Date: Thu, 29 Mar 2007 23:38:30 +0200 From: Dragan Noveski <perodog(a)gmx.net> Subject: Re: [linux-audio-user] Peak Level Monitor/Limiting i think, recording at low level, you are kind of "loosing disc space". lets say, if you are recording at 24bit, on low level the signal information will take only 12 bit (example) and the rest of 12 bit will be only empty data information. don't think that one can repair that with some gain plugin or normalization... If you think about this for a couple of seconds, you may decide to reformulate your opinion. In a low-level signal, you say the "top" (Most Significant) bits will be zero. In a high-level signal, though, the bottom 12-bits are all ones. What is the difference? In the computer, a signal is a signal, regardless of the value at which it is represented. It is only when you try and look at the distance from that signal to either the noise floor or the max, or deal with non-linear perceptual effects (equal loudness curves, etc.) that level may come into play. It's not the absolute level that matters, it's the dynamic range. Cheers, Phil M -- "To misattribute a quote is unforgivable." -- Anonymous

17 years, 1 month

[linux-audio-user] Newbie problems with 4 synths resolved

by Damon Chaplin

Hi, I wrote a while back about problems getting synths up and running: >I bought my first midi keyboard last week (a CME UF5), and it's great >fun with the Reason demo in Windows. But I've spent hours and hours >messing with about 4 different synths under Linux and each one failed >(in a different way, of course!). I've now managed to get them all working so I thought I'd report the problems and fixes here, in case anyone is interested. (This is all on Fedora Core 6, so other distros may have other issues.) 1) JACK - at first, qjackctl wouldn't start it (though ardour would). I then tried running it as root, which worked OK but wasn't ideal. Finally I found http://www.passback.co.uk/music/fedora-music-intro/ which explained about editing /etc/security/limits.conf and now it works fairly smoothly. (And I got ZynAddSubFX working.) Though I have to start JACK with qjackctl - the code to automatically start it doesn't work. It outputs: exec of JACK server failed: No such file or directory This seems to be a known problem: http://www.nabble.com/the-fix-for-jackd-libjack-tmpdir-mismatches-t3156301.… 2) amSynth - the main problem was figuring out how to connect up my midi keyboard to it and get a sound out of it. I still don't know how to do this with ALSA, but the fedora-music-intro document above helped me get it set up with JACK. 3) ams - the problem here was that most of the demos/tutorials required various LADSPA plugins that I didn't have. I had to do a lot of googling to figure out what package each one was part of. 4) bristol - at first it crashed on startup. This turned out to be a bug in Fedora Core 6 - gethostbyname("localhost") was returning NULL as the /etc/hosts file didn't have an entry for localhost. I then tried it with ALSA, but it wouldn't start up because of problems either with real-time priority or with the period size. I eventually got it working with JACK. 5) fluidsynth - it seems that some .sf2 files work but some don't. It outputs things like: fluidsynth: warning: Ignoring sample mgtr: can't use ROM samples I finally found Unison.sf2 which seems to work OK. So the main problem was lack of documentation for new users. With just a few sentences of good documentation I could probably have got them all running pretty easily. Hardly anyone explains how to connect up the inputs and outputs to get the synths working with JACK. (Are we supposed to be psychic??) I noticed that some synths automatically connect up the outputs (bristol, amSynth), but not all of them. None of them automatically connect to my MIDI keyboard. Why not? Anyway, hope this helps in some way. Damon

17 years, 1 month

[linux-audio-user] Newb MIDI questions here...

by clinart

Hello. I'm excited about my new audio setup. Got everything working nicely. Have no experience or knowledge of audio engineering so please bear with me if I ask dumb questions. 1) Why use MIDI? I have heard stuff that I recorded professionally sequenced with MIDI and must say that I can hear a difference. Is this because it's all perfectly synced up? What are other advantages, if any, of MIDI over audio? I'd like to play with Rosegarden but don't have any MIDI files except the ones I made with Hydrogen. If I wanted to sync up a guitar track perfectly with the MIDI beat, I guess the best way would be to have the guitar track as MIDI too, but I don't have a MIDI hardware device. Next question... 2) Is there Linux software that can convert an audio signal/file to MIDI? Thanks in advance for answering these basic questions. -- View this message in context: http://www.nabble.com/Newb-MIDI-questions-here...-tf3468151.html#a9676817 Sent from the linux-audio-user mailing list archive at Nabble.com.

17 years, 1 month

[linux-audio-user] Problem with latest Rosegarden - recorded midi notes end up splitted.

by Cesare Marilungo

Basically, if I'm recording live on a midi track and I keep the note sustained for more then a measure, instead of a single prolonged note I get two or more notes, starting and ending exactly at the beginning each new measure. Is it a bug or a feauture? :-) Am I doing something wrong? I don't remember this behavior on previous versions. Ciao, c. -- http://www.cesaremarilungo.com

17 years, 1 month

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Linux-audio-user March 2007