Linux-audio-user April 2024

linux-audio-user@lists.linuxaudio.org

15 participants
14 discussions

by Will Godfrey

Does anyone know of software that can generate MIDI messages from a touchpad? The idea would be to send CCs to a sequencer or soft synth, but being able to send it to an external hardware device would also be very useful. -- Will J Godfrey https://willgodfrey.bandcamp.com/ http://yoshimi.github.io Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

3 months, 1 week

[LAA] Ratatouille.lv2 v0.2 released

by Hermann Meyer

Ratatouille is a Neural Model loader and mixer for Linux/Windows. ![Ratatouille](https://github.com/brummer10/Ratatouille.lv2/blob/main/Ratatouille.png?raw=true) Ratatouille allow to load up to two neural model files and mix there output. Those models could be [*.nam files](https://tonehunt.org/all) or [*.json or .aidax files](https://cloud.aida-x.cc/all). So you could blend from clean to crunch for example, or, go wild and mix different amp models, or mix a amp with a pedal simulation. To round up the sound it allow to load up to two Impulse Response files and mix there output as well. You could try the wildest combinations, or, be conservative and load just your single preferred IR-File. Each neural model may have a different expected Sample Rate, Ratatouille will resample the buffer to match that. On the Release Page been ready to use binaries, note please that Ratatouille.lv2-v3-v0.2-linux-x86_64.tar.xz is a fully optimized version using the x86-64-v3 optimisation, you could check if your system supports that by running the command `/usr/lib64/ld-linux-x86-64.so.2 --help 2>/dev/null | grep 'x86-64-v3 (supported'` if that return nothing, your system can't use this, in that case you should choose Ratatouille.lv2-v0.2-linux-x86_64.tar.xz Impulse Response Files will be resampled on the fly to match the session Sample Rate. To build from source, please use Ratatouille.lv2-v0.2-src.tar.xz as only that contain the needed submodules. Release Page: https://github.com/brummer10/Ratatouille.lv2/releases/tag/v0.2 Project Page: https://github.com/brummer10/Ratatouille.lv2

8 months, 3 weeks

update of zita-at1

by Fons Adriaensen

Hello all, zita-at1-0.8.2 is now available on <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/index.html> This fixes a bug (accidentally deleted lines) in 0.8.1 which resulted in total silence at higher sample rates... Ciao, -- FA

8 months, 4 weeks

Pitch estimation

by Fons Adriaensen

Hello all, Several people have asked how the pitch estimation in zita-at1 works. The basic method is to look at the autocorrelation of the signal. This is a measure of how similar a signal is to a time-shifted version of itself. It can be computed efficiently as the inverse FFT of the power spectrum. In many cases the strongest autocorrelation peak corresponds to the fundamental period. But this can easily get ambiguous as there will also be peaks at integer multiples of that period, and for strong harmonics. To avoid errors it is necessary to look also at the signal spectrum and level, and combine all that info in some way. How exactly is mostly a matter of trial and error. Which is why I need more examples. Have a look at <http://kokkinizita.linuxaudio.org/linuxaudio/pitchdet1.png> This a test of the pitch detection algorithm used in zita-at1. The X-axis is time in seconds, a new pitch estimate is made every 10.667 ms (512 samples at 48 kHz). Vertically we have autocorrelation, the Y-axis is in samples. Red is positive, blue negative. The green dots are the detected pitch period, zero means unvoiced. The blue line on top is signal level in dB. Note how this singer has a habit of letting the pitch 'droop', by up to an octave, at the end of a note. He is probably not aware of it. This happens at 28.7s, again at 30.8s, and in fact during the entire track. What should an autotuner do with this ? Turn the glide into a chromatic scale ? The real solution here would be to edit the recording, adding a fast fadeout just before the 'droop'. Even a minimal amount of reverb will hide this. The fragment from 29.7 to 30.3s is an example of a vowel with very strong harmonics which show up as the red bands below the real pitch period. In this case the 2nd and 3rd harmonic were actually about 20 dB stronger than the fundamental. This is resolved because the autocorrelation is still strongest at the fundamental pitch. The very last estimate in the next fragment (at 30.85s) is an example of where this goes wrong, the algorithm selects twice the real pitch period, assuming the first autocorrelation peak is the 2nd harmonic. This happens because there was significant energy at the subharmonic, actually leakage from another track via the headphone used by singer. The false 'voiced' detection at 30.39s is also the result of a signal leaking via the headphone. Ciao, -- FA

9 months

Ratatouille.lv2 v0.1 released

by Hermann Meyer

Ratatouille is a Neural Model loader and mixer for Linux/Windows. ![Ratatouille](https://github.com/brummer10/Ratatouille.lv2/blob/main/Ratatouille.png?raw=true) Ratatouille allow to load up to two neural model files and mix there output. Those models could be [*.nam files](https://tonehunt.org/all) or [*.json or .aidax files](https://cloud.aida-x.cc/all). So you could blend from clean to crunch for example, or, go wild and mix different amp models, or mix a amp with a pedal simulation. To round up the sound it allow to load up to two Impulse Response files and mix there output as well. You could try the wildest combinations, or, be conservative and load just your single preferred IR-File. On the Release Page been ready to use binaries, note please that Ratatouille.lv2-v3-v0.1-linux-x86_64.tar.xz is a fully optimized version using the x86-64-v3 optimisation, you could check if your system supports that by running the command `/usr/lib64/ld-linux-x86-64.so.2 --help 2>/dev/null | grep 'x86-64-v3 (supported'` if that return nothing, your system can't use this, in that case you should choose Ratatouille.lv2-v0.1-linux-x86_64.tar.xz To build from source, please use Ratatouille.lv2-v0.1-src.tar.xz as only that contain the needed submodules. Release Page: https://github.com/brummer10/Ratatouille.lv2/releases/tag/v0.1 Project Page: https://github.com/brummer10/Ratatouille.lv2

9 months

Update of zita-at1

by Fons Adriaensen

Hello all, Zita-at1-0.8.1 is now available at the usual place: <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/index.html> Note: this is not (yet) the new zita-at2 that will have formant correction. Changes: - Bug fixes. - Improved pitch estimation algorithm. - Low latency mode, reduces latency to around 10 ms. Note to Robin Gareus: The new Retuner class can probably be used without changes in the x42-autotuner plugin. The logic that controls jumping forward/back while resampling has been changed. Instead of just trying to avoid reading outside the available input range, it now tries to keep the read index as close as possible to the ideal position, i.e. 'latency' samples behind the write index. That also means that for unvoiced input it will be within +/- 1.3 ms of the ideal position, so nothing special is required for this case. Ciao, -- FA

9 months

[music] Walking on trees

by Jeanette C.

Hey hey, new music: https://youtu.be/_Qsr5tS86QA It's an improvised piece, sounding a bit latin American. All instruments are physically modelled or physically informed, real instruments that might be, put into a nice 3d room, so best put your headphones on. The piece was recorded/performed in MIDI, bounced to audio using some of my Csound instruments and then processed through a virtual 3d room in Csound with a bit of EQ and compression at the end. Hope you enjoy it! Best wishes, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c I know you're out there and I know that you still care <3 (Britney Spears)

9 months, 1 week

Behringer UMC1820 ADAT madness (not all channels working on SOME Laptops)

by nik＠parkellipsen.de

Hi, I have a Behringer UMC1820 that served me well in many multi-channel concerts I played. Now I need a few more channels, so I borrowed an ADAT expander (a re-purpused MOTU Traveler mkIII Firewire interface). I tried with two laptops, one Lenovo IdeaPad Flex 5 (11th gen Intel I7) and one Lenovo ThinkPad T14 Gen 3 (12th gen Intel I7). Other than that, both laptops have the same configuration. Arch Linux (updated today), Pipewire, Wireplumber, all drop-in replacements for pulse, Jack, etc, down to the same pipewire.conf (I copied that over). Here's the weirdness: On the ThinkPad, all ADAT output channels of the Behringer work, I can see the lights blinking and hear the sound. On the IdeaPad, only ADAT output channels 5-8 work, channels 1-4 are dead. I've tried different USB ports and so one, but nothing made a difference. An ideas where I could look? Could there be a setting I missed? Best, N

9 months, 1 week

vocal tracks wanted

by Fons Adriaensen

Hello all, I'm working on an improved version if zita-at1 which most of you probably know as the x42-autotune plugin. The update, zita-at2, will preserve formants while retuning. To test and develop this I need some clean vocal tracks, in particular of female singers and also very low (bass) males. So if you have these available, I'd be very happy if you can share them. They won't be used of course for any other purpose than to improve the retuner algorithm. TIA for anything you can provide ! -- FA

9 months, 1 week

Experiences with AES67-Daemon ?

by nik＠parkellipsen.de

Hi, I stumbled across this project: https://github.com/bondagit/aes67-linux-daemon and I wonder if anyone has practical experience with it or ever used it in a production setting. I'll soon have the chance to play on a 16-channel setup, which is run by Dante, and the project claims compatibility, but I don't have any experience with it so far. Best, N

9 months, 1 week

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Linux-audio-user April 2024