Linux-audio-user October 2007

linux-audio-user@lists.linuxaudio.org

147 participants
141 discussions

by holborn

Hi I have a little confusion with some real time kernel settings, sure will be hardware dependent, but ... I really interested to discuse of some settings like the following and others: --- Enable the block layer [ ] Support for Large Block Devices [ ] Support for tracing block io actions [ ] Support for Large Single Files [ ] Block layer SG support v4 (EXPERIMENTAL) IO Schedulers ---> Processor type and features ---> HPET Timer Support Device Drivers ---> Character devices ---> <*> Enhanced Real Time Clock Support [ ] Real Time Clock Histogram Support <*> Priority Inheritance Debugging (Blocker) Device Support [ ] HPET - High Precision Event Timer Sound ---> Advanced Linux Sound Architecture ---> <M> RTC Timer support [*] Use RTC as default sequencer timer I have this settings ..... but .... ALSA don't load snd_rtctimer running lsmod I can only see snd-timer .... and I need to load snd-rtctimer by hand ... but in fact I don't know what module is used. Thanks Josep

18 years

Sound in Linux

by Shelagh Manton

I have some general questions about sound in linux; the interplay of pulse/(esd) and gstreamer,jackd and alsa. Let me state what I think I know. Alsa provides the drivers that allow sound to be produced and also the midi subsystem. You can use just the alsa system if you want to use audio or midi, but if you want to use (possibly) more than one program that uses sound eg the system sounds that gnome and kde make when alerts happen and say a music program, you need to use something like pulse or esd, or dmix in alsa. This is because the program captures the whole use of the sound card and can't release it for other programmes. If you want to use midi and audio together as in rosegarden, you need jackd because that allows more than one program to access the soundcard at a time. It is also useful because if you have the right kernel and privileges your audio programme can override the right of other programmes to access the kernel as well meaning that you don't get glitches when you are recording a masterpiece. Gstreamer fits in the normal esd/pulse picture by providing the access to codecs that files come in. Now this is where my understanding fails: gstreamer has a jack module (so I hear rumoured, but I can't find it in the ubuntu reps) and so does pulse. How do these fit in with the jackd stuff? Obviously they both make it so that jack can work with both or either of the sound servers. I welcome corrections in my interpretation of what's happening. Shelagh

18 years

Re: [LAU] Music making on low spec laptop

by Atte André Jensen

chris beagles wrote: > Is there any where you can recommend that I can get free samples from? From time to time some suggestions pop up here, but I can't really recommend any site in particular since I rarely shop there. It also depends heavily on your taste and style of music... > Google brings up loads of results. Have always used soundfonts and live > synths to create music. Soundfonts wouldn't bee too taxing on the cpu either AFAIK. Try fluidsynth or one of it's guis, most notably Qsynth and fluidsynth-dssi.so (the later for instance with ghostess). Soundfonts are of course much easier to deal with than single samples when we're talking about multi sampled instruments like piano. BTW: The best (free) piano I heard is ftp://musix.ourproject.org/pub/musix/sf2/Steinway_IMIS2.2/Steinway_IMIS2.2.… For drums, I always design a kit for each song, and specimen is super-super fast at doing that. > Will have a read through the online pd help manual, never managed to > grasp it before but i shall try and persevere this time! It's not that tricky. And the community is very helpful. -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://modlys.dk

18 years

Music making on low spec laptop

by Martin Ahnelöv

> Is it feasible to be able to do any sort of composition with this sort > of > setup? > Algorithmic music FTW! Gasten

18 years

Two Questions or Surveys

by Ricardo Lobo

Hi People, I have two questions, or maybe we can call it, surveys. First: Is there anyone here who uses LASH? I tried it but I didn't found it useful, am I missing something? Second: Yesterday I was told to try the OSS V4.0, because it is -- or so I was told -- better than ALSA. It goes against what I think to be the common opinion around here. Thanks, Lobo

18 years

Music making on low spec laptop

by chris beagles

Afternoon list, Just curious about the possibilities of making music with my lowend laptop. It is a Compaq Armada E500 with a Pentium 3 800MHz and 192MB of RAM. Im running ubuntu gutsy (rc1) with kernel 2.6.22-14-rt and openbox. Im wondering about what programs I can use to compose that wont completely overload my laptop. I normally use ardour, hydrogen, qjackctl, qsynth, seq24 and zyn in my studio at home. But this laptop definitely wont handle all of that (or even much of that). Is it feasible to be able to do any sort of composition with this sort of setup? Cheers, Chris

18 years

Re: [LAU] Jack command line connect

by Simon Williams

Geoff Beasley wrote: > You are not running a RT kernel; that's your problem. For any serious > audio work you MUST run a RT kernel. You can roll your own quite easily > if you wish, or use one of a number of specially prepared audiocentric > distro's for linux; eg: Planet CCRMA, 64 Studio,Musix and many others. Aha! It turns out that there is no official Arch RT kernel (for whatever reason). However, some nice person has a feed with an RT patched kernel for Arch- I've installed that and now I have no xruns- woohoo! Thanks Simon

18 years

Jack command line connect

by Simon Williams

In my attempt to stop the flipping xruns I get even from a really simple jack/fluidsynth (with 6.5mb soundfont) setup, I'm going to see if I can get it to run without xruns at all- so I'm going to stop the X server (which takes up quite a lot of cpu and memory). Before I can do this, I need to work out how on earth to connect fluidsynth to alsa_pcm without qjackctl. Why are there no man pages or --help or anything for jack_connect, etc? I've tried the obvious: "jack_connect fluidsynth alsa_pcm", but that doesn't work and without any usage information whatsoever I'm completely stuffed. Also, a command line list of port names that can be connected would be nice. Thanks Simon

18 years

Moving devices to different IRQs

by Mark Constable

It's probably hardwired and dependent on the mainboard but I thought I'd ask this anyway, just in case someone has an idea. I notice Chuckks' /proc/interupts is like this below whereas my Abit AN-M2 (nForce4) setup follows... is there anyway I can manipulate my interupts so the USB devices line up on a single IRQ like Chuckks ? CPU0 0: 7451384 IO-APIC-edge timer 1: 16910 IO-APIC-edge i8042 8: 0 IO-APIC-edge rtc 12: 91809 IO-APIC-edge i8042 14: 55194 IO-APIC-edge ide0 16: 17785 IO-APIC-fasteoi eth1, HDA Intel 17: 124946 IO-APIC-fasteoi bcm43xx 19: 41988 IO-APIC-fasteoi ohci_hcd:usb1, ohci_hcd:usb2, ehci_hcd:usb3 20: 1 IO-APIC-fasteoi yenta, tifm_7xx1 21: 3228 IO-APIC-fasteoi acpi CPU0 CPU1 0: 136 561 IO-APIC-edge timer 1: 49 27195 IO-APIC-edge i8042 8: 0 0 IO-APIC-edge rtc0 9: 0 30 IO-APIC-fasteoi acpi 14: 0 0 IO-APIC-edge libata 15: 0 0 IO-APIC-edge libata 16: 13465 13271804 IO-APIC-fasteoi ohci_hcd:usb1, ahci 17: 13523 11359306 IO-APIC-fasteoi ohci_hcd:usb2, eth0 18: 4 2906 IO-APIC-fasteoi ehci_hcd:usb3, HDA Intel 19: 5332 4029220 IO-APIC-fasteoi ehci_hcd:usb4, nvidia I have a problem with distorted USB sound (Tascam US-122) but no matter what USB port I use it is always doubled up with another device. If I could "force" all the USB busses onto one IRQ (or ideally ohci_hcd on one and ehci_hcd on another), and made sure my US-122 was the only USB device, then that might make a difference. --markc

18 years

[ANN] LV2 vocoder plugin released

by Nedko Arnaudov

This is first release of the LV2 vocoder. Code is based on version 0.3 of LADSPA plugin created by Josh Green. LADSPA plugin created by Josh Green is basically an adaption of Achim Settelmeier's Vocoder program to LADSPA. Code and screenshots can be found here: http://nedko.arnaudov.name/soft/lv2vocoder/ If you get DNS resolve problems, you can try this URL instead (may not work in future): http://triton.atia.com/nedko/soft/lv2vocoder/ -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

18 years

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Linux-audio-user October 2007