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20706 discussions

by LAC

Hi everyone, We're happy to announce that LAC-19 videos can now be watched online directly from the conference website: https://lac.linuxaudio.org/2019/#program This would not have been possible without Carlos Sanchez and Dave Kerr's hard work!!! Enjoy and feel free to ask if you have any questions! Cheers, The LAC-19 team ps: sorry for the delay but organizing a conference is quite intense and we did have to take a little break after LAC-19 happened ;)

6 years, 5 months

[LAU] [new music] a premature birthday greeting to Yoshimi

by Jeanette C.

Hey hey, I know that the official date is the 1st of Septembre, but I'll be a little out of touch, so I have decided to post my birthday contribution today. Beautiful, excellent birthay dear Yoshimi :) youtu.be/0luuMWOYBV0 I stayed with the electronic genre, which is an obvious choice, but I have tried to go down a different route with a different sound. A more RNB inspired song in rhythm and arrangement, though the harmonies tell a more classical story. The bridge is strongly influenced by Cesar Franck Prelude et variations. It's a beautiful piece, you'll find a lovely version on the Aeolus demo page. Listen out for the small section leading from the opening part to the quieter verse. It's the best way I can describe it. :) The sounds are mostly from the Jeanny's Genius soundbank for Yoshimi: http://juliencoder.de/sound/jg_yoshimi_patches-0.1.tar.bz2 The big bang is from the noise bank and the lead is the officially approved "Will Godfrey's favourite lead sound". The latter is admittedly a tad low in the mix. I tried it at more volume, but found it too straining for my ears. I thik I might be a little sensitive in that frequency range and then this song is quite different from Will's serene, open tunes, where this sound can flow much more freely. So: happy birthday Yoshimi, for ten years you're a very grown up little girl with (not so) hidden depth to your character. An inspiring "play mate". Best wishes, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * SoundCloud: https://soundcloud.com/jeanette_c * Twitter: https://twitter.com/jeanette_c_s * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c There's a girl in the mirror I wonder who she is Sometimes I think I know her Sometimes I really wish I did <3 (Britney Spears)

6 years, 5 months

[LAU] Record / playback MIDI through MIDI <--> USB cable?

by Kevin Cole

Hi, I'm on an Arch Linux system, and now have an old Yamaha PSR-220 (TM) "portable keyboard" and an iConnectivity Mio (TM) MIDI to USB cable. My MIDI-fu is extremely limited. When I plug in the cable, it shows up (sans name) in lsusb as "Bus 001 Device 005: ID 2321:000a" What is a good way to save keyboard stuff as .mid files and vice-versa (play MIDI files out to the keyboard)? Last week I fooled around with cat'ing to and from /dev/snd/midiC1D0 as mentioned in [https://askubuntu.com/questions/633185/how-to-send-midi-raw-data-to-a-midi-…] and was able to get "noise" sending a MIDI file out, and get "garbage" from the keyboard. I just don't know the RIGHT way to do stuff. (My web searches weren't turning up obvious leads, which is how I ended up at the above. It sounded like the closest to what I was trying to ask.) Thanks.

6 years, 5 months

Re: [LAU] Filtering out everything but the centre position in stereo

by Jeanette C.

Aug 22 2019, Ralf Mardorf has written: ... > On the quick my guess is > > Original left channel + inverted right channel = plain_left > Original right channel + inverted left channel = plain_right > > Original left channel + inverted plain_left = middle only > Original right channel + inverted plain_right = middle only ... That sounds good. Unforunately it didn't work. Perhaps too many differences due to the old tape and having been stored as an MP3. Well, it was worth a try. the result is good enough, I suppose. :) Best wishes and thanks, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * SoundCloud: https://soundcloud.com/jeanette_c * Twitter: https://twitter.com/jeanette_c_s * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c She's so lucky, she's a star But she cry, cry, cries in her lonely heart... <3 (Britney Spears)

6 years, 5 months

Re: [LAU] Filtering out everything but the centre position in stereo

by James Harkins

---- On Fri, 23 Aug 2019 09:16:23 -1000 Ralf Mardorf <ralf.mardorf(a)alice-dsl.net> wrote ---- > Yes, there are pitfalls [1.1], however, if you have good luck, you might > come relatively close to the desired result. No, I don't think so. I get the reasoning: the karaoke effect works by subtracting the two channels, so that anything that is equal volume and equal phase between the two channels will cancel out. We could call this a "residual." Then you think "if I subtract the residual from the total, I should get only the center material." But the math just doesn't work. L = left channel R = right channel residual = L - R Well, here's the logical error. That's not actually a "residual" (whatever "residual" was expected to mean). It's just the Side of a M/S configuration, nothing more. So then you think, "I have an original left channel -- subtract the residual and get some sort of remainder." left_anti_residual = L - residual = L - (L - R) = L - L + R = R right_anti_residual = R - (R - L) = R - R + L = L So, hooray, you've flipped the left/right stereo image and not removed anything. "But if you sum to mono"... then you get R + L = Mid. A mono mix, with nothing removed. (You had suggested that an effect that is deliberately phase-inverted between the two channels would cancel out in this case. Of course... but that's rather special pleading, isn't it? How often does that happen in the real world?) OK, then, maybe the mistake was subtracting from the individual channels. Maybe you need to go to the total and subtract the residual. Total = L + R = Mid of a M/S configuration. Total - Residual = M - S = right channel + 6 dB Total - neg(Residual) = M + S = left channel + 6 dB Sum that to mono and you get M - S + M + S = 2M = the same mono mix, only 6 dB louder. Simple sums and differences of left and right channels will, as far as I can see, never recover the "center" material. hjh

6 years, 5 months

Re: [LAU] Filtering out everything but the centre position in stereo

by James Harkins

On Aug 22 2019, Ralf Mardorf has written: > ... >> On the quick my guess is >> >> >> Original left channel + inverted right channel = plain_left >> Original right channel + inverted left channel = plain_right >> >> >> Original left channel + inverted plain_left = middle only >> Original right channel + inverted plain_right = middle only > ... > That sounds good. Unforunately it didn't work. I went down that road once before. "Plain" channels: a = l - r ("side" in mid/side) b = r - l Then l - a = l - (l - r) = r and r - b = r - (r - l) = l, neither of which isolates the center. The idea of the karaoke effect is to cut in-phase material that is in common between the channels (e.g. often lead vocals). You'd think you can do the karaoke effect and then some subtraction would leave you with "whatever is not the karaoke effect," but in fact, variables cancel out in a way that you don't get anything useful. This might be the reason why you don't find a lot of plugins for this. hjh Sent with AquaMail for Android https://www.mobisystems.com/aqua-mail

6 years, 5 months

[LAU] Mtrack-8 oddity

by Will Godfrey

I've had one of these running perfectly for near 2 years now and have always run it with a buffer size of 64 frames/48kHz. This last week I've been too busy with 'other things' to do any composition. However, yesterday when I tried to run it. Jack immediately went into a cascade of Xruns with a most peculiar error report, suggestion it couldn't find the unit. Running Yoshimi by itself under Alsa worked fine, so I was now totally perplexed. Eventually I noticed that Yoshimi was set to 128 frames. When I set it to 64, it was even stranger. It ran, but on attempting to play anything it just made a horrible noise. Further tests revealed that jack also ran correctly with 128 frames or more. For a while I couldn't think of anything that had changed during that week - no upgrades or installs. Then I remembered I'd had to repair a bad solder joint in the amplifier, and as everything is mounted in a rack, had to pull quite a bit of stuff apart to get to it. I was quite sure I'd checked everything when re-assembling it, but just to be sure did a quick 'lsusb' in a terminal window, and as I thought, audio, midi, and mouse/keyboard were all on a different internal bus, and no bus had anything else on it. Today, while playing a CD on my 'office' machine I remembered I used to have a USB CD player that wouldn't work when plugged into the front USB3 sockets, even though it was identified on an internal USB2 bus, so checking the music system, I had indeed plugged it onto one of these on the back of that machine. Once swapped into a (black) USB2 socket it once again worked fine. I've no idea why it had given the symptoms it did though! -- 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.

6 years, 5 months

[LAU] Filtering out everything but the centre position in stereo

by Jeanette C.

Hey hey, is there an effect or a method to filter out everything from a stereo file but the "centre"? A sort of reverse karaoke effect. In theory I'd know what to do, just not how to achieve it. i.e. find all the differences between the channels and subtract the respective difference from each channel. Any good tool/plugin or method to implement in something like Csound is appreciated. Best wishes and thanks, jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * SoundCloud: https://soundcloud.com/jeanette_c * Twitter: https://twitter.com/jeanette_c_s * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c She's so lucky, she's a star But she cry, cry, cries in her lonely heart... <3 (Britney Spears)

6 years, 5 months

[LAU] A cardboard audio control panel

by david

https://www.rhythmo.io/ Suitable for beginners or cheap folk? -- David W. Jones gnome(a)hawaii.rr.com authenticity, honesty, community http://dancingtreefrog.com

6 years, 6 months

[LAU] Creative Sound Blaster X-Fi HD occasionally drops out of ALSA.

by crocket

It drops out especially when I boot. This drop-out happens occasionally. I thought my mainboard was dying, but other USB devices weren't dropping out. Do I need to get a replacement for my USB soundcard? Or, is it a software issue?

6 years, 6 months

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