Linux-audio-user September 2011

linux-audio-user@lists.linuxaudio.org

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Focusrite Saffire 6 USB Audio Interface

by Bernardo Barros

Hi, Any issues or happy stories about this Saffire USB interface? I'm planning to buy one usb interface soon. Thanks,

14 years

[OT?]Call for papers about open source and music education

by Ketil Thorgersen

Hi list As a long time user of linux audio and a researcher and teacher educator in music education, I have the honour of being a guest editor of a special issue of the Journal of Music, Technology and Education with the title: "An examination of affordances of the application of ‘open source’ to music education" If any of you are involved with research in this area - or know people who are, we would very much like to have articles. There is even room for more praxis based articles in this issue. More info here: http://www.intellectbooks.co.uk/weblog/view-Post,id=48388/ All the best Ketil Thorgersen

14 years

[OT] cpufreqd and kernel configuration (Julien Claassen)

by Ralf Mardorf

> Hello everyone! > Sorry for being so OT (again). I had to recompile my own kernel and now > cpufreqd doesn't work. I wonder what I need to enable in the kernel to have > cpufreqd work? What should be the standard cpu frequency scheduler? Which > other schedulers can or must be there? Can I put them into the kernel or will > they have to be modules? > My current kernel config can be found as: > http://juliencoder.de/kconfig > Thanks for reading so far and thanks in advance even more for thinking about > it. > Kind regards > Julien As I've written to your PM off-list before. If this is, like it is ... # # CPU Frequency scaling # CONFIG_CPU_FREQ=y CONFIG_CPU_FREQ_TABLE=y # CONFIG_CPU_FREQ_DEBUG is not set # CONFIG_CPU_FREQ_STAT is not set # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y # CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set CONFIG_CPU_FREQ_GOV_PERFORMANCE=y CONFIG_CPU_FREQ_GOV_POWERSAVE=y CONFIG_CPU_FREQ_GOV_USERSPACE=y CONFIG_CPU_FREQ_GOV_ONDEMAND=y CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y ... and it is, just run cpufreq-selector -g performance when you're making music and run cpufreq-selector -g ondemand for office thingies etc. and don't forget, you might need to push Ctrl + C, if the terminal should hang. Don't call this issue OT! It is a PITA and not OT.

14 years

Re: [LAU] A good Sampler

by sonofzev＠iinet.net.au

On Sun Sep 11 23:46 , harryhaaren(a)gmail.com sent: >I've had this coded up before, the problem is that if you want to "pitch shift" each sample individually it really does become pretty heavy on the CPU. Unless your not *dynamically* changing the value of the pitch shift, in which case it can be rendered to a buffer & just played back.I would share the source if it was in better condition, most of it is hacks on hacks for extra random features... but I can zip it & ship it to somebody if they'd care to take a look. A JACK client wrapper would need to be coded up, its only the "sampler / pitch shifter" now. > Best free library from timestretch I know of is the RubberBand one.There is also SoundTouch, its LGPL even more relaxed than the GPL of RubberBand. Its what I used for the project mentioned above.Cheers, -Harry Hydrogen 0.9.5 does all of this .. It uses the rubberband library and has a fairly simple interface.. you don't have to use it's internal sequencer.. but it's pretty damned good for writing loops..

14 years

buying a new laptop

by Atte André Jensen

Hi My laptop was dropped, and if it's beyond repair, I need a new one quickly. I would appreciate a few (preferrably hands-on experiences or) advices to this end, here are a few thoughts: 1) It should of course work as flawless with linux as possible (I run arch) 2) I have an edirol fa66 firewire soundcard that I'm quite happy with. Problem is, it seems laptops with firewire are hard to find. I could get an usb soundcard, but I have the feeling that it's not gonna perform as well (low latency, stability) as firewire, it that correct? Plus it's annoying to throw away (or sell) a perfectly good, stable soundcard that suits my needs, just because of the port type... 3) I would prefer a small (<= 13") light-weight, long-battery-life laptop. 4) I actually don't really need that much cpu power. I have a 2Ghz dual-core intel (T7250, whatever that means) now, that's more than enough. It's the first dual core I owned, and I had the feeling the two cores provides a snappier feeling, would others agree? Besides that I don't need the speed I have now. Options (I can think of): I saw a secondhand ThinkPad X61s (dual-core 1.6Ghz, 3Gb ram, 12" display) from a well known online shop I trust and used many times (bought my current laptop there). There's 6 months warrenty, and my general impression with ThinkPads is that they have good build quality, it's the only laptop I would consider buying used. It has firewire so... Go the netbook route. I'm at a loss here, all these new processors, both the i-series and the atom (N-series), I have no idea how well they perform. I tried a few from friends, and they seem fast enough. Anyone here making music on a netbook? This would most certainly mean I would have to get a usb soundcard, hmmm :-( Any inputs would be greatly appreciated :-) -- Atte http://atte.dk http://modlys.dk

14 years

New ambdec release

by Fons Adriaensen

Hello all, A long due update of ambdec is available at the usual place: <http://kokkinizita.linuxaudio.org/linuxaudio/downloads>. >From the README: * This release supports any format up to full 3rd order, including mixed order schemes such as e.g. 3h1v (W, X, Y, Z, S, T, U, V, N, O, P, Q) and not just 3h1p (W, X, Y, Z, U, V, P, Q). The 'hv' forms are really superior as they preserve azimuth resolution at any elevation, while the 'hp' form is just the sum of a higher order horizontal decoder and a lower order periphonic one. * The matrix and speaker views in the config window have gone. There is really no point in editing high order matrices manually. You can still edit the preset file which uses a textual form of OSC. * The config window shows a graphical representation of the input signals expected by a preset. At least these signal must be provided for correct results. * Spaces in jack port names are accepted. Use either single or double quotes, or escape the spaces as '\ '. * Some new presets, e.g. for a 'cube+faces' (14 speakers) which works great for full 2nd order. Some others have gone. If you need anything specific just ask. * The manual has not yet been updated, but if you used ambdec before you won't need it. Make sure to read the complete README which contains some info on using existing preset files with this release. Enjoy ! -- FA

14 years

Re: [LAU] buying a new laptop

by rosea grammostola

On 09/10/2011 02:00 PM, linux-audio-user-request(a)lists.linuxaudio.org wrote: > The "nurple" is actually called the TrackPoint. I first met it when I > > had to borrow a Thinkpad to take notes in a meeting. I used it for 45 > > minutes. After I returned it and went back to my regular desktop > > keyboard (sans Trackpoint) I found myself automatically reaching for the > > (non-existent) TrackPoint. Found it very easy to control, but I have a > > rather light touch. A heavy touch would make it hard to use. > > > > I consider them one of the most ergonomic and best pointing control > > devices anyone's made. Although my person favorite pointing device is > > still a Wacom graphics tablet. I bought a T61 and liked the keybd so much that I also bought a Lenovo keyb with a Trackpoint :) http://www.amazon.com/ThinkPad-USB-Keyboard-with-TrackPoint/dp/B002ONCC6G%3… They have changed the position and size of the Esc and Delete button, which counters the criticism of Ken for a part at least I think. \r

14 years

Re: [LAU] buying a new laptop

by Clemens Ladisch

andy baxter wrote: > The specific problem I'm trying to solve is that the firewire card in > the laptop is on the same irq as the onboard sound card and one of the > usb ports: > > 17: 271 120 IO-APIC-fasteoi uhci_hcd:usb6, HDA Intel, ohci1394 > > [USB] Buses 1 and 2 are used by plug-in devices; 3 is used by onboard > peripherals, and the rest seem to be unused, so I assume that it doesn't > matter that usb6 is shared; only the sound-card. When an interrupt on line 17 arrives, the kernel asks all attached drivers whether their device needs servicing. Big latencies usually are the result of long-running interrupt handlers, so an unused device does not matter much, but these interrupt checks still are unneeded work. Please note that UHCI and EHCI controllers share ports; UHCI is for USB 1.x devices, EHCI, for 2.0 ones. Therefore, one of your ports will be usb6 when you connect a full- or low-speed device. (Only very incompetent laptop makers wouldn't deactivate unused controllers.) > Is what you're saying that the only way round the problem is to disable > the other devices on that irq altogether? I'm not sure whether those other interrupt handlers are much of a problem, but if they are, yes. Please note that shared interrupts are not the only latency source; interrupt handlers for any device (or system management interrupt handlers installed by the BIOS) could block the CPU for too long. And just to show off: here is my /proc/interrupts, with four PCI(e) cards: :-) CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 0: 135 0 0 7 779 205506 IO-APIC-edge timer 1: 1 0 0 0 9 7300 IO-APIC-edge i8042 4: 0 0 0 0 0 2 IO-APIC-edge 7: 0 0 0 0 0 0 IO-APIC-edge parport0 9: 0 0 0 0 0 0 IO-APIC-fasteoi acpi 14: 0 0 0 0 1 53 IO-APIC-edge pata_atiixp 15: 0 0 0 0 0 0 IO-APIC-edge pata_atiixp 16: 0 0 0 0 3 885 IO-APIC-fasteoi hda_intel 17: 0 0 0 0 0 5 IO-APIC-fasteoi firewire_ohci 18: 0 0 0 0 2 1712 IO-APIC-fasteoi radeon 19: 0 0 0 0 2 18 IO-APIC-fasteoi hda_intel 20: 0 0 0 0 134 42418 IO-APIC-fasteoi oxygen 21: 0 0 0 0 0 0 IO-APIC-fasteoi EMU10K1 22: 0 0 0 0 0 0 IO-APIC-fasteoi YMFPCI 23: 0 0 0 0 0 5 IO-APIC-fasteoi firewire_ohci 40: 565565 0 0 0 0 0 HPET_MSI-edge hpet2 41: 0 0 0 0 0 0 PCI-MSI-edge aerdrv, PCIe PME 42: 0 0 0 0 0 0 PCI-MSI-edge aerdrv, PCIe PME 43: 0 0 0 0 36 15254 PCI-MSI-edge ahci 44: 0 0 0 0 0 0 PCI-MSI-edge eth0 45: 0 0 0 0 16 713 PCI-MSI-edge ehci_hcd:usb1 46: 0 0 0 0 0 0 PCI-MSI-edge ehci_hcd:usb2 47: 0 0 0 0 0 804 PCI-MSI-edge ohci_hcd:usb3 48: 0 0 0 0 0 40 PCI-MSI-edge ohci_hcd:usb4 49: 0 0 0 0 0 1 PCI-MSI-edge ohci_hcd:usb5 50: 0 0 0 0 0 1 PCI-MSI-edge ohci_hcd:usb6 51: 0 0 0 0 0 0 PCI-MSI-edge ohci_hcd:usb7 NMI: 0 0 0 0 0 0 Non-maskable interrupts LOC: 159 538453 575689 528275 507949 690032 Local timer interrupts SPU: 0 0 0 0 0 0 Spurious interrupts PMI: 0 0 0 0 0 0 Performance monitoring interrupts IWI: 0 0 0 0 0 0 IRQ work interrupts RES: 34599 25532 23354 12203 15350 13619 Rescheduling interrupts CAL: 1122 7777 981 718 1188 11005 Function call interrupts TLB: 279 8399 908 624 485 550 TLB shootdowns THR: 0 0 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 0 0 Machine check exceptions MCP: 23 23 23 23 23 23 Machine check polls ERR: 0 MIS: 0 Regards, Clemens

14 years

broken links on linuxaudio.org web site

by Tony Austin

I can't remember how I signed up for the LAU list, but it wasn't easy. The subscribe links on http://lau.linuxaudio.org/ and http://quicktoots.linuxaudio.org/index.php?t=1 are both broken. Tony

14 years

ESI Maya 44 PCI

by A S

Hi, There is some info around that there was work being done to have the ESI Maya 44 PCI card work with ALSA. However, it seems to have been stalled. Can anyone confirm the status of this card with regard to ALSA? I have the card and can get sound from it, but have been having trouble making it work properly in a xubuntu 11.04 + KXStudio setup. I just want to make sure I'm not wasting my time with a card that will never work properly with a linux distro. Many thanks.

14 years

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Linux-audio-user September 2011