8 May
2010
8 May
'10
1:45 a.m.
On Fri, May 7, 2010 at 4:17 PM, Geoff King <gsking1(a)gmail.com> wrote:
I have problem that I've been trying to figure out
with no luck. The
audio interface keeps changing for example:
Today: Maudio 24/96 is hw:1 and Midisport 4x4 Anniv is hw:0.
Yesterday before reboot: Maudio 24/96 is hw:0 and Midisport 4x4 Anniv is
hw:1
etc, back and forth, each reboot...
Consider setting up /etc/modprobe.d/*.conf file to ensure a consistent
ordering of all your USB devices.
for example, I use:
-rw-r--r-- 1 root root 1760 2010-03-12 11:32
/etc/modprobe.d/snd_usb_audio.conf
##
## NPM: force ALSA USB sound device id's s.t. cat /proc/asound/cards gives
## 0 [Headset ]: USB-Audio - Logitech USB Headset
## Logitech Logitech USB Headset at
usb-0000:00:12.0-2, full speed
## 1 [SB ]: HDA-Intel - HDA ATI SB
## HDA ATI SB at 0xfb9f4000 irq 16
## 2 [M66 ]: ICE1712 - M Audio Delta 66
## M Audio Delta 66 at 0xe880, irq 21
## 3 [MT4 ]: USB-Audio - MT4
## Emagic MT4 at usb-0000:00:12.1-1, full speed
## 4 [BCD3000 ]: USB-Audio - BCD3000
## Behringer BCD3000 at usb-0000:00:13.1-2, full speed
## 5 [UM2 ]: USB-Audio - UM-2
## EDIROL UM-2 at usb-0000:00:12.1-3, full speed
## (see
## (see http://alsa.opensrc.org/index.php/MultipleUSBAudioDevices )
##
alias snd-card-0 snd-usb-audio ## --> Headset
## snd-card-1 ## --> SB
## snd-card-2 ## --> M66
alias snd-card-3 snd-usb-audio ## --
MT4
alias snd-card-4 snd-usb-audio ## --> BCD3000
alias snd-card-5 snd-usb-audio ## --> UM-2
alias snd-card-6 snd-usb-audio ## --> LPK25
##
## lsusb gives following devices w/ vid/pid's:
## Headset: Bus 003 Device 003: ID 046d:0a0c Logitech, Inc.
## MT4: Bus 004 Device 002: ID 086a:0003 Emagic Soft- und Hardware GmbH
MT4
## UM-2: Bus 004 Device 005: ID 0582:0005 Roland Corp. Edirol UM-2 MIDI
Adapter
## BCD3000: Bus 006 Device 005: ID 1397:00bf
## LPK25: Bus 005 Device 003: ID 09e8:0076 AKAI Professional M.I. Corp.
##
options snd-usb-audio index=0,3,4,5,6 vid=0x046d,0x086a,0x1397,0x0582,0x09e8
pid=0x0a0c,0x0003,0x00bf,0x0005,0x0076
I usually use qjackctl and have to keep changing the presets with settings
which is annoying.
You can also use "Symbolic" names for ALSA devices which will make them not
depend on a particular device number, e.g.
> aplay -l | grep M66
card 2: M66 [M Audio Delta 66], device 0: ICE1712 multi [ICE1712 multi]
So use "M66" as the ALSA name, for jack, e.g. '/usr/bin/jackd -dalsa
-dhw:M66 ...'
Niels
http://nielsmayer.com
PS: you may want to leave device 0 unreserved. That way when you plug in a
new USB device (before you've added it to /etc/modprobe.d) it won't get
assigned to card0 automatically. That's what would happen by default (a bug
IMHO) and prevent whatever you had setup previously as card0 from
iniitializing.
Then when jack or alsa attempts to use the card, it fails. In fact, plugging
in a new unrecognized usb device, then starting up qjackctl can cause
qjackctl to place some bad values in ~/.config/rncbc.org/QjackCtl.conf and
the next thing you know your audio is all horked up (even after removing the
offending USB device and rebooting) until you delete the QjackCtl.conf and
set it up from scratch.