Linux-audio-user March 2013

linux-audio-user@lists.linuxaudio.org

114 participants
126 discussions

[LAU] Two exact same drumpads, different USB ID's

by Jeremy Jongepier

Dear all, I got two cheap drumpads here that are _exactly_ the same, also on the inside (PCB's have the same revision ID): http://dx.com/p/portable-roll-up-usb-drum-kit-118841 But they get recognized differently, one as an USB MIDI device and the other as an USB HID device. And when it gets recognized as a HID device it's pretty useless because I can't hook it up easily to software that accepts MIDI input. This is the "working" drumpad (the one that gets recognized as an USB MIDI device): /var/log/syslog: Mar 3 13:09:40 piertje kernel: [ 864.820341] usb 5-2: new full-speed USB device number 2 using uhci_hcd Mar 3 13:09:40 piertje mtp-probe: checking bus 5, device 2: "/sys/devices/pci0000:00/0000:00:1d.0/usb5/5-2" Mar 3 13:09:40 piertje mtp-probe: bus: 5, device: 2 was not an MTP device Mar 3 13:09:40 piertje kernel: [ 865.123664] usbcore: registered new interface driver snd-usb-audio Mar 3 13:09:40 piertje pulseaudio[2044]: [pulseaudio] module-alsa-card.c: Failed to find a working profile. Mar 3 13:09:40 piertje pulseaudio[2044]: [pulseaudio] module.c: Failed to load module "module-alsa-card" (argument: "device_id="1" name="usb-UTECK_MIDI_DRUM-00-DRUM" card_name="alsa_card.usb-UTECK_MIDI_DRUM-00-DRUM" namereg_fail=false tsched=yes ignore_dB=no deferred_volume=yes card_properties="module-udev-detect.discovered=1""): initialization failed. lsusb: Bus 005 Device 002: ID 0218:0001 Hangzhou Worlde This is the non working drumpad: /var/log/syslog: Mar 2 20:49:45 piertje kernel: [ 3040.388297] usb 5-1: new full-speed USB device number 7 using uhci_hcd Mar 2 20:49:45 piertje mtp-probe: checking bus 5, device 7: "/sys/devices/pci0000:00/0000:00:1d.0/usb5/5-1" Mar 2 20:49:45 piertje mtp-probe: bus: 5, device: 7 was not an MTP device Mar 2 20:49:45 piertje kernel: [ 3040.602562] generic-usb 0003:1941:8021.0001: hiddev0,hidraw0: USB HID v1.10 Device [HID 1941:8021] on usb-0000:00:1d.0-1/input0 lsusb: Bus 005 Device 005: ID 1941:8021 Dream Link WH1080 Weather Station / USB Missile Launcher So my questions are, why does this happen? The PCB is extremely simple and only has one small IC. Is the USB ID determined by this IC? And the big question, can I trick this non working pad to get recognized as a valid USB MIDI device? I already looked into this (unbinding, binding, new_id) but can't get it to work. And I'm 100% sure these pads are exactly the same. I could use this: https://code.google.com/p/drumroll/ But I get the idea this is not necessary. drumroll also already consumes 4% CPU on my notebook and I want to use this drumpad with my Raspberry Pi, besides, it's extra overhead and only runs SUID. So anybody any idea how I could trick my system in properly recognizing this non working drumpad? I don't mind hacking kernel modules if that would be necessary. Thanks in advance, Jeremy

12 years, 11 months

[LAU] using multiple ams patches

by rosea.grammostola

Hi, If you want to use multiple AMS patches at onces, you've to load multiple instances of AMS right? How should I route midi output from a sequencer or hardware controller with one single midi output to those multiple instances of AMS without triggering all the AMS instances? AFAIK qmidiroute has only 2 output ports. \r

12 years, 11 months

[LAU] swing midi plugin / tool

by rosea.grammostola

Hi, Is there a plugin / tool who can add swing feel to midi, in case an sequencer doesn't have a swing function? \r

12 years, 11 months

[LAU] VLC Bug?

by Ralf Mardorf

If I play a MP3 with $ pacman -Q vlc vlc 2.0.5-4 by jack and the volume is set to 100%, I hear and see clipping in hdspmixer. It goes up to 0 dBFS at around 90%. FWIW the volume can be increased up to 200%. Anybody experiencing the same on (what distro ever)?

12 years, 11 months

[LAU] jackd thinks it's got realtime priority, but it doesn't

by Paul Coccoli

I just noticed this on my Fedora 17 system. I run jackd like this: [paul@watt ~]$ /usr/bin/jackd --realtime -dalsa -dhw:0 -r48000 -p512 -n2 jackdmp 1.9.9.5 Copyright 2001-2005 Paul Davis and others. Copyright 2004-2012 Grame. jackdmp comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details no message buffer overruns no message buffer overruns no message buffer overruns JACK server starting in realtime mode with priority 20 audio_reservation_init Acquire audio card Audio0 creating alsa driver ... hw:0|hw:0|512|2|48000|0|0|nomon|swmeter|-|32bit configuring for 48000Hz, period = 512 frames (10.7 ms), buffer = 2 periods ALSA: final selected sample format for capture: 32bit integer little-endian ALSA: use 2 periods for capture ALSA: final selected sample format for playback: 32bit integer little-endian ALSA: use 2 periods for playback Using port names patch v0.1 (07.04.2010) Trying to load portnames from /home/paul/.config/jack/cards/M Audio Delta 66.ss.ports.in Trying to load portnames from /home/paul/.config/jack/cards/M Audio Delta 66.ports.in Trying to load portnames from /etc/jack/cards/M Audio Delta 66.ss.ports.in Trying to load portnames from /etc/jack/cards/M Audio Delta 66.ports.in Trying to load portnames from /home/paul/.config/jack/cards/M Audio Delta 66.ss.ports.out Trying to load portnames from /home/paul/.config/jack/cards/M Audio Delta 66.ports.out Trying to load portnames from /etc/jack/cards/M Audio Delta 66.ss.ports.out Trying to load portnames from /etc/jack/cards/M Audio Delta 66.ports.out Everything looks fine, and jackd claims it has realtime mode. I've been away from Linux audio for a while, but doesn't realtime mode mean RT scheduling? If I check the process's scheduler policy and priority, it is NOT RT: [paul@watt ~]$ ps -p 20370 -o cmd,class,pri,rtprio CMD CLS PRI RTPRIO /usr/bin/jackd --realtime - TS 19 - I've added myself to the jackuser group: [paul@watt ~]$ groups paul wheel dialout wireshark jackuser That group is already set up properly: [paul@watt ~]$ cat /etc/security/limits.d/95-jack.conf # Default limits for users of jack-audio-connection-kit @jackuser - rtprio 70 @jackuser - memlock 4194304 @pulse-rt - rtprio 20 @pulse-rt - nice -20 Anyone have any idea what's going on here?

12 years, 11 months

[LAU] Special Consideration for WD Green HDDs

by Ralf Mardorf

Until now I didn't test it myself, but since several people are annoyed by WD's drive killer, it might be interesting for this list. In a German Arch forum, https://bbs.archlinux.de/viewtopic.php?pid=300934#p300934 , I get the hint that there is idle3ctl -d, see the English Arch Wiki, https://wiki.archlinux.org/index.php/Advanced_Format#Special_Consideration_… .

12 years, 11 months

[LAU] midi controller - softsynth

by rosea.grammostola

Hi, At the moment I'm trying to bind my bcr2000 to amsynth. Midi learn works fine so far and I understand that I need to save a preset in the bcr2000, but when I reconnect amsynth, the binding doesn't work anymore, so I guess I also have to save and load something in amsynth? Anyone experience with a hardware midi controller (maybe even the bcr200) and AMS? Does that work ok? Best regards, \r

12 years, 11 months

[LAU] [Fwd: Re: Channel Linux - BETA]

by Ralf Mardorf

-------- Forwarded Message -------- From: Ralf Mardorf <ralf.mardorf(a)alice-dsl.net> To: linux-audio-user <linux-audio-user(a)lists.linuxaudio.org> Subject: Re: Channel Linux - BETA Date: Thu, 14 Mar 2013 11:58:15 +0100 PS: Firefox 19.0.2 claims that additional plugins are required to play all media contend on http://channellinux.com/. However, it can play the videos. Firefox claims that there's a try to redirect to another page. Ghostery informs about e.g. a Zuckerberg connection. We know that your website is a serious website, but if I wouldn't know you from the mailing lists, I wouldn't stay on this website, even if I should be fine with advertising. It's against my self-responsibility when using the Internet to stay on sides that come with to much nick-nack.

12 years, 11 months

[LAU] State of native Linux REAPER port

by Dan MacDonald

Yesterday I finally tried the native Linux port of REAPER and posted the following reports to the Cockos forum at http://forum.cockos.com/showthread.php?t=83324 so I thought everyone here would be interested too. - danboid's 1st post to REAPER WDL dev thread - It appears to me there was a brief resurgence of activity on the Linux Swell port in December but little if anything has happened since? I hope I'm wrong! I couldn't believe it when I discovered earlier today that there has been some sort of rudimentary native Linux port of REAPER on LoL since June 2011! I've long known REAPER was supported and ran well under wine but I have a big issue with depending upon wine - I don't really like using REAPER that way because I'm all too aware of the negative impact the wine layer has on (JACK) performance and stability. I only heard about the Linux native port in late December when my current band PistonFunkMachine used it to record our debut album. For yet another unknown reason, it was only today that I was inspired to find out where the Swell port is up to and if possible give it a go myself. Although it seems to still be practically unusable right now, I was thrilled to see REAPER start up successfully and let me use most of the interface. This was when using the libswell within libSwell-x86_64-debian-wheezy-gtk3.tar.xz running under 64bit KX Studio 12.04.2. REAPER loads and you can add tracks and browse through the menus here but I realised I wasn't going to get much further when I discovered that the open/save file windows don't appear when you select either option and the same goes for the plugin window. It doesn't appear here! I compiled Swell from git but had much less success. REAPER failed to start at all and just barfed: ./reaper: symbol lookup error: /home/dan/src/reaper_linux_x86_64/REAPER/libSwell.so: undefined symbol: gdk_init_check So, I may not be able to enjoy REAPER under my OS of choice properly just yet but I'll be trying some of REAPERS VST plugins under qtractor soon. When I have I'll report back here with the plugin results. I also spotted a small error in: http://www.landoleet.org/dev/libSwell-roll-your-own.txt It says: apt-get install build-essentials libgtk-3-dev but the package name is actually build-essential without the 's'. Total nitpick, I realise - especially at this stage! I'm hoping Bitwig and Ardour 3.0 will give reason for more LinuxVST plugin ports in the run up to LinREAPER. I'll certainly be buying REAPER as soon as the Linux port works! - Today's update re: plugins - I have tried a few of the REAPER VST FX under qtractor but unfortunately all I get is a stream of various 'SWELL API not found' errors. I copied libswell (the binary from LoL that lets me start REAPER) into /usr/lib as well as my vst plugins dir but that didn't help.

12 years, 11 months

[LAU] Sending audio out and back into JACK

by Andrew C

Hey all, No question is a stupid question, as they say, so I might as well ask. What kind of external audio hardware/JACK trickery would I need to send a synth running on my laptop through a seperate output channel on an audio interface with multiple ins/outs, send it, let's say, through some outboard effects, and then back into the laptop as a seperate input? Cheers, Andrew.

12 years, 11 months

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Linux-audio-user March 2013