Linux-audio-user

linux-audio-user@lists.linuxaudio.org

4 participants
20686 discussions

by Alf Haakon Pietruszka Lund

Hello list! I am on (K)Ubuntu Studio 20.04) and needed a couple of extra in- and outputs, so I connected 2 USB audio interfaces to my computer (a FocusRite Scarlett 2i4 and an Edirol UA-25ex - they're old, but reliable devices). Through Studio Controls I set the Scarlett as master device and started Jack, then I experienced recording and playback with Ardour in (as far as I can hear) perfect sync. I was amazed at the ease of this setup and the problem-free routing of audio signals, so just for testing I split a stereo source recording one channel on each device to one stereo track in Ardour. To my ears, the sync is still perfect. However, from this article https://jackaudio.org/faq/multiple_devices.html it seems I have to expect sync problems over time unless I do some manual configuring using the alsa_in and alsa_out clients. Is this still valid?

4 years, 6 months

Fwd: Hum pickup in DI boxes

by Brandon Hale

Not sure if you meant to send it privately, but I suppose putting it publicly won't hurt. -------- Forwarded Message -------- Subject: Re: [LAU] Hum pickup in DI boxes Date: Tue, 8 Jun 2021 17:39:26 +0100 From: Bill Purvis <bill(a)billp.org> Reply-To: bill(a)billp.org To: Brandon Hale <bthaleproductions(a)gmail.com> Hi Brandon, On 08/06/2021 17:29, Brandon Hale wrote: > We have the Behringer x32 at the place of my work. Why not just use a > 3.5mm male to RCA L+R male out and plug into the aux input on the > Behringer? That's what those inputs are for, right? That's what we do > at work and have had success with it running small conferences with > little to no audible noise. > > I hope I'm not muddying the waters more here, > > Brandon Hale That would be fine, except the rack is in a separate, locked, room, and the operating desk only has access to XLR sockets in the floor. Failure on my part to anticipate the need! ;-) Bill -- +----------------------------------------+ | Bill Purvis | | email: bill(a)billp.org | +----------------------------------------+

4 years, 6 months

anyone checked out new USB reduced latency patch?

by Chris Caudle

I just saw that this is probably going in the 5.14 kernel: https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/?h=f… This is the description: "USB-audio driver behaves a bit strangely for the playback stream -- namely, it starts sending silent packets at PCM prepare state while the actual data is submitted at first when the trigger START is kicked off. This is a workaround for the behavior where URBs are processed too quickly at the beginning. That is, if we start submitting URBs at trigger START, the first few URBs will be immediately completed, and this would result in the immediate period-elapsed calls right after the start, which may confuse applications. "OTOH, submitting the data after silent URBs would, of course, result in a certain delay of the actual data processing, and this is rather more serious problem on modern systems, in practice. "This patch tries to revert the workaround and lets the URB submission starting at PCM trigger for the playback again. As far as I've tested with various backends (native ALSA, PA, JACK, PW), I haven't seen any problems (famous last words :) "Note that the capture stream handling needs no such workaround, since the capture is driven per received URB." Curious if anyone has a setup that can backport this and see if it changes the behavior of different latency every time you start. If I get time to work on that this weekend, what would be the best setup? Just patch output to input and run jack_iodelay over and over? Have Ardour run latency test multiple times? Both? -- Chris C

4 years, 6 months

Release(?): A web based multi-track video player with volume mixer

by Laborejo Software Suite

Ladies and Gentlemen, this is some form of release. Example first: https://laborejo.org/multichannelplayer/ Have you ever tried to convince your friends and family to install a Linux system just so they can replicate your modular setup to listen to a pre-production where they are supposed to play the saxophone solo? Me neither. But I don't think it would work. Instead: This web software with the catchy name Multichannel_Web_Video_Audio_Player_With_Volume_Mixer is a tool for the boss (you) of ensembles and bands to distribute pre-productions for practice. But nothing keeps you from using it for real music with, as some kind of novelty player. The user can adjust the volume levels of individual instruments and follow along a visual presentation (notation, conductor video etc.). This includes optional tracks, such as metronome clicks, spoken instructions or alternative versions of tracks. Because it relies on simple video files there is no limit to quality and flexibility. Works in every browser. No downloads. No obscure technology is involved. This can be used by the 60+ generation in your choir. The provided Git/README (see link below) gives more ideas and examples why this tool could be beneficial to you. The README also helps to setup your own player and offers a workflow to produce videos, which is quite complicated to be honest. This is not a "proper" release because there is nothing to package. You just copy files to your web server. License is AGPL 3 or later. https://git.laborejo.org/lss/Multichannel_Web_Video_Audio_Player_With_Volum… Yours, Nils Laborejo Software Suite https://www.laborejo.org

4 years, 7 months

can jackd or ardour be forced to use interleaved mode?

by Chris Caudle

Does anyone know if jackd (or the Ardour ALSA backend) can be forced to use interleaved mode? I am trying to work around a problem where a driver only supports interleaved access, but apparently jackd and Ardour try to open in non-interleaved mode. In parallel I am helping someone else check if there is some function missing that should inform applications that only interleaved mode is supported, and someone else is going to look at adding non-interleaved mode, but in the mean time I would like to find a work around if possible. -- Chris Caudle

4 years, 7 months

Minimalist telephone interview setup

by Alf Haakon Pietruszka Lund

Dear list! I just spent a lot of time finding a good setup for telephone interviews. In case someone else is interested for making podcasts or live shows of some sorts, I thought I'd share the setup: # Hardware Laptop, smartphone, USB interface, iRig 2, microphone, headphones. XLR cable for the mic, 2 Jack - Jack 1/4" TS cables, USB cable. I'm switching between an Edirol UA-25ex and a Focusrite Scarlett 2i4. Proper connection of the phone to the setup was a headache and I spent quite some time testing a range of adapters. Most of them require an electret mic to function, which does not go well with my setup. Thanks to https://m.youtube.com/watch?v=wl6YuVu_v_g for pointing me to the iRig. # Connections Mic > USB 1 USB out 1 > iRig instrument input iRig amp out > USB 2 iRig < > telephone iRig set to FX To cancel echo from my own voice the Input / Monitor selector on the USB needs to be set almost fully counter-clockwise (almost input only). # Software Kubuntu Studio 20.04, Ardour 6.6, Studio Controls 2.1.64, Carla 2.3.0, Ubuntu studio backports PPA. # Software connections 1. Set Ardour to handle monitoring 2. Set Ardour Master to send L/R to System playback 2 3. Set up a mono foldback bus in Ardour for mix minus (everything except the caller). Foldback sends to System Playback 1 4. Use Carla > Patchbay to disconnect System playback from pulse_out Using a cheap Shure PG58 mic this setup is close to noiseless, even in my bedroom home office :-) Regards, Alf

4 years, 7 months

List of FOSS Sampled Instrument Libraries for musicians - Hand selected and curated

by Laborejo Software Suite

Hello LAUs, Here is a list I am working on at the moment that I wanted to share with you. I feel like I've written this already in 2012, but some stuff is worth repeating :) https://hilbricht.net/foss-sampled-instruments.html "This is a hand selected and curated list of sampled music instrument libraries for software samplers that musicians can use without worrying, but which are also free and open source. Through strict requirements and thorough research we hope that this list can be trusted." (Guest appearances by Aeolus and setBFree :)) It is work in progress, but already useful, I hope. Yours, Nils

4 years, 7 months

Re: [LAU] List of FOSS Sampled Instrument Libraries for musicians - Hand selected and curated

by Laborejo Software Suite

Hi Paul. thanks for the answer. The following is not meant as "told you so!". But I also want to show, that I care about this subject and made my homework. > sorry, that reply may have sounded a bit grumpy. it's just a bit irritating > sometimes to see well-intentioned efforts that seem to miss so many of the > resources they need to cover in order to give people a full picture. And sometimes a well meaning reply is also wrong: That Aeolus and setBfree are sample-less software synthesizers was not only hinted at through " Guest appearances by Aeolus and setBFree :) " but it also mentioned three times on the website itself. Once under "All software synthesizers" and then in each individual description. The samples from pianobook.co.uk all do not fulfill my requirements. See also their terms and conditions: https://www.pianobook.co.uk/terms-conditions/ Quote: " You may not sell sample(s), or give away any sample(s) for use by any other person(s)." And to anticipate one possible reply: My list is not a matter of what is fair and moral and possibly enough to make music. It has a 100% clear, law to the letter, no exceptions approach. I also wrote: "The strict constraints mean that this list will never be very large. Creating sampled instruments is a time-consuming and expensive task and is usually undertaken with the intention of making money from the result, thus not distributing the instrument as free and open source. This is by no means condemnable, but in this case it is simply not our topic. " And finally, from your .sf2 image I can tell at a first glance several well-known illegal rips, instances where the authors falsely claimed "public domain" and cases where the license simply do not meet my requirements, the requirements I prominently put in their own chapter. For example Florestan is well know copyright infringement, SC55 is already clear that these are just Roland samples, G-Town is not as free as people like to think, they are probably worth an entry on my "Other list" (that is linked on the page). Some of the .sf2 are synthesizer sounds, which I clearly declared "out of scope", even if they were CC0 sf2. And maybe they are just bad sounds. As I wrote: "They either have to be of decent quality, or at least be the only ones of their kind." For example balafon1.sf2, which I even created an .sfz version from in 2012. However, I would not recommend that to anyone because I dislike the sound. So, it is possible that a few of these .sf2 are indeed good fits for my list. And in this case I welcome any suggestion, as written on the page. However, I require a source that I can review. With the risk to sound grumpy as well: This time my efforts were already ahead. The "full picture" is sadly not as full as it should be. Not many people have the time, money and skills to produce samples, and that shows. People are desperate and want every sample-lib to be free and good. But most of the time they aren't, but yet another EMU Proteus rip, or something like this. I hope this example of the research-and-elimination process shows why I think I am the right person to create that list. Yours, Nils On Thu, 27 May 2021 16:48:25 -0600 Paul Davis <paul(a)linuxaudiosystems.com> wrote: > sorry, that reply may have sounded a bit grumpy. it's just a bit irritating > sometimes to see well-intentioned efforts that seem to miss so many of the > resources they need to cover in order to give people a full picture. > > here's what i mean. > > first, a shot of the pianobook libs i have on my machine - more or less all > those available in DS format. Just two days, we got a beautiful full > orchestra lib there (NFO...) > > [image: image.png] > > next, here's a listing of all the SF2 libs i was able to find that were > gratis+libre during a big search a couple of years ago. I don't like most > of these - SF2 is an inadequate format for msot instruments, though it > works well for percussive sounds: > > [image: image.png] > > > On Thu, May 27, 2021 at 4:03 PM Paul Davis <paul(a)linuxaudiosystems.com> > wrote: > > > > > > > On Thu, May 27, 2021 at 3:44 PM Laborejo Software Suite <info(a)laborejo.org> > > wrote: > > > >> Hello LAUs, > >> > >> Here is a list I am working on at the moment that I wanted to share with > >> you. > >> I feel like I've written this already in 2012, but some stuff is worth > >> repeating :) > >> > >> https://hilbricht.net/foss-sampled-instruments.html > > > > > > Aeolus and SetBFree are not sampled instruments. They are synthesizers > > that generate sound from scratch. > > > > You;ve also skipped all of the libraries on pianobook.co.uk that are in > > DecentSampler format, and can thus be played in either DecentSampler > > (gratis, non-libre) or sfizz (gratis & libre) > > > > > >

4 years, 7 months

Fwd: The audacity of Audacity: Telemetry / Google Analytics added

by Kevin Cole

'A massive middle finger': Open-source audio fans up in arms after Audacity opts to add telemetry capture Move comes days after firm acquired by Muse Group https://www.theregister.com/2021/05/07/audacity_telemetry/ The article notes that it's actually an "opt in" but cautions that users might mistakenly do so.

4 years, 7 months

Transient Detection

by Brandon Hale

Hello all, I am looking for a program that can chop an audio file by its transients. Are there any good tools for doing that? I really would like a command line program ideally, as I want to split up a whole folder of drum breaks into individual transients. Thanks so much for any help you can offer, Brandon Hale

4 years, 7 months

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Linux-audio-user