Linux-audio-user July 2014

linux-audio-user@lists.linuxaudio.org

89 participants
59 discussions

[LAU] A short story: from zero to recording the drums in a budget

by Carlo Ascani

Hi guys, I own an acoustic drum, and I wanted to record it. My set looks like this [1], and I wanted 8 mics to record it. So, starting from *just* the drums, I bought everything I needed: 1. The Mixer I got a second hand Soundtracs Topaz Micro (I used its Inserts as Direct Outs) for 220 euros 2. The PC I got an IBM Thinkcentre 8215 for 50 euros 3. The converters I got an Echo Layla 20 for 50 euros, it has 8 analog ins and it is really well supported by alsa. 4. The Monitors I got a pair of second hand KRK Rockit 5 for 150 euros 5. Cables and mic stands Got them for around 250 euros 6. The mics I got an Audix D6 and a Sennheiser e609 for kick, a Revox m3500 and a Beyer m610 for the snare, two Sennheiser e609 for the floor toms and a pair of Sennheiser e614 as overheads. The total cost of those mics (second hand) is 600 euros. So, the total price of the whole thing was around 1320 euros! Here are some audio clip of the result, dry recording [2] and processed with some eq, compressor and reverb [3] So guys, what do you think? If I would improve the quality of my recordings, where should I spend more money? PS: I suck at playing [1] http://carlorat.me/drumset.jpg [2] http://carlorat.me/noproc_session.ogg [3] http://carlorat.me/proc_session.ogg -- Carlo Ascani | carlorat.me skype: carloratm irc: carloratm@freenode

11 years, 5 months

[LAU] Disabling IRQ #19

by Peter P.

Dear List, I have a strange and unreproducable error on my laptop, that halts the entire audio system randomly about once every three weeks. Jackd quits, with it all clients, and dmesg says: [21684.947293] irq 19: nobody cared (try booting with the "irqpoll"option) [21684.947303] Pid: 194, comm: irq/19-ehci_hcd Not tainted 3.2.0-4-rt-amd64 #1 Debian 3.2.54-2 [21684.947309] Call Trace: [21684.947327] [<ffffffff81098889>] ? __report_bad_irq+0x2c/0xb5 [21684.947336] [<ffffffff81098c6d>] ? note_interrupt+0x16f/0x1f2 [21684.947344] [<ffffffff81097969>] ? irq_thread_fn+0x32/0x32 [21684.947351] [<ffffffff81097969>] ? irq_thread_fn+0x32/0x32 [21684.947358] [<ffffffff8109783c>] ? irq_thread+0x106/0x201 [21684.947367] [<ffffffff81097736>] ? irq_finalize_oneshot+0xb3/0xb3 [21684.947378] [<ffffffff81062ee4>] ? kthread+0x78/0x80 [21684.947385] [<ffffffff8103f2fa>] ? get_parent_ip+0x9/0x1b [21684.947395] [<ffffffff8136a0f4>] ? kernel_thread_helper+0x4/0x10 [21684.947405] [<ffffffff81062e6c>] ? rcu_read_unlock_sched_notrace+0x2a/0x2a [21684.947412] [<ffffffff8136a0f0>] ? gs_change+0x13/0x13 [21684.947417] handlers: [21684.947429] [<ffffffff81096e34>] irq_default_primary_handler threaded [<ffffffffa003d483>] usb_hcd_irq [21684.947473] [<ffffffff81096e34>] irq_default_primary_handler threaded [<ffffffffa025a85a>] ips_irq_handler [21684.947485] [<ffffffff81096e34>] irq_default_primary_handler threaded [<ffffffffa04d62cd>] snd_hdsp_interrupt [21684.947498] Disabling IRQ #19 The sound card is an RME Multiface via an ExpressCard in a Thinkpad X201s. The card itself had been working reliably since more than ten years by now (not with the ExpressCard though). Running on Debian RT Kernel. I have no way to set/change the IRQ assignments in this BIOS. Interrupt 19 is shared by modules ehci_hcd:usb2, ips, snd_hdsp, where the two others are USB and the thermal subsystem. I assume ehci_hcd:usb2 denotes the second USB bus. If this is correct, there are no devices connected to it at the moment, according to lsusb (except for USB hubs). Web research has shown that people suggest using the kernel option "irqpoll" or disable "threadirqs", use "noirqdebug" or "irqdebug" options (apparently quite expensive in computation), or the irqbalance package. https://bbs.archlinux.org/viewtopic.php?id=133327 gives a hint about deinstalling laptop-mode-tools, which I am running, and which made the problem go away for the poster. As the error occurs so infrequently, I can not yet verify if any of these help, and am hoping for some hints or experience from this list. Please, any help or ideas are desperately needed, as this is a production system that is used in live shows in front of large audiences, and I absolutely need to resolve that error. Thank you for all ideas, best, Peter

11 years, 5 months

Re: [LAU] Roland Octa-Capture

by Clemens Ladisch

Kevin Utter wrote: >> Please show the output of "lsusb -v" for this device. > > Its listed here. That was without "-v". Please run "lsusb -v -d 0582:0120". >> If you know how to compile your own kernel ... > > I'm willing to learn, but just haven't done this yet. How to do this depends on the distribution. >> If the Octa-Capture is similar to the Quad-Capture, then basic playback >> and capture will work, but not any front-panel controls, which might >> make it unusable. > > Meaning it would disable the front-panel controls? That is what happens with the Quad-Capture. Regards, Clemens

11 years, 5 months

[LAU] Slowing down audio while keeping same pitch ?

by jonetsu＠teksavvy.com

Is it possible to slow down an audio file (mp3 for instance) while keeping the same pitch ? Does it even make sense ? The software would have to insert more of the same audio 'bits' to make it last longer. Is it possible ? Cheers.

11 years, 6 months

[LAU] Measuring the acoustical characteristics of my studio using FLOSS software?

by Gabriel Nordeborn

Hi! I'm in the midst of trying to treat my room acoustically, and I really want to do measurements of my room acoustically. Of course, I know way too little about this, and therefore, I need your help as always! ;) (if you reply to this e-mail, imagine I'm 5 years old when you explain stuff). So, what I have is this: - A set of studio monitors (Adam A3X) - A microphone (Senheiser MK4) - A room... - My studio computer with Linux What I want to do, roughly, is this: - Through a test tone(? test sound?) measure the frequency "response" of the room. I want to get a nice curve, like an equalizer, which tells me roughly how my room responds to the different frequencies. - I want to do this before and after I apply treatment. So, my question is: How on earth do I do this?! Are there FLOSS tools available for this? Is it easy to do something as basic as this? Best wishes, zth/Gabriel

11 years, 6 months

[LAU] music software for kids

by Brian Sorahan

Hi all, Are there any music applications for linux that would be suitable for a 10 year old to sit down and have fun without reading any documentation? (i.e. something as simple as Mario Paint Composer, which I played with and loved as a child) I've scanned the list at http://wiki.linuxaudio.org/apps/start and googled but nothing is jumping out at me. Thanks! Brian Sorahan

11 years, 6 months

[LAU] OT: new free soundset for DSI Prophet 12

by F. Silvain

Hey hey, not sure, if this is welcome, but I just uploaded a new free soundset for the DSI Prophet 12 hybrid synthesizer. It's a superb hardware instrument. Feel free to pass the links along! http://freeshell.de/~silvain/p12_fs1_soundset.zip http://freeshell.de/~silvain/p12_fs2_soundset.zip The first is a revision of the already existing soundset on my website. Both soundsets now upload to any of the 8 soundbanks of the Prophet 12. Enjoy and nice weekend! Ta-ta ---- Ffanci * Internet: http://freeshell.de/~silvain

11 years, 6 months

[LAU] drum synth

by James Morris

Hi, Are there any floss synths for linux dedicated to drum synthesis? James.

11 years, 6 months

[LAU] Beta testers required...

by Fons Adriaensen

Anyone interested in beta-testing this please let me know. Zita-njbridge ------------- Command line Jack clients to transmit full quality multichannel audio over a local IP network, with adaptive resampling at the receiver. Main features: * One-to-one (UDP) or one-to-many (multicast). * Sender and receiver(s) can each have their own sample rate and period size. * Up to 64 channels, 16 or 24 bit or float samples. * Receiver(s) can select any combination of channels. * Low latency, optional additional buffering. * High quality jitter-free resampling. * Graceful handling of xruns, skipped cycles, lost packets and freewheeling. * IP6 fully supported. * Requires zita-resampler, no other dependencies. Note that this version is meant for use on a *local* network. It may work or not on the wider internet if receiver(s) are configured for additional buffering, and if you are lucky. The current code will replace any gaps in the audio stream by silence, and does not attempt to re-insert packets that arrive out of order. You will need a fairly recent Jack version, as the code uses jack_get_cycle_times() and no fallback for that is provided. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow)

11 years, 6 months

[LAU] Kxstudio RT kernel vs low latency

by Russell Hanaghan

Hey, Is anyone achieving significant audio latency gains or xrun stability using a RT kernel with Kxstudio or similar Ubuntu studio distro's? If so, which kernel / where /do I gotta roll my own? Thanks! ~ Russell

11 years, 6 months

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Linux-audio-user July 2014