Missing channels on Terratec 6Fire USB

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Hi,

I'm trying to install the Terratec 6Fire USB audio device. It's an 
external audio device with several analog in & output channels.

The alsa-driver is running and I can play analog stereo music or movies 
on pulseaudio based players.

I can output digital sound (ac3 or dts) on spdif via optical with vlc 
and mplayer.

But I can't output analog multichannel sound from flac files or movies. 
Although alsamixer can access all 6 analog output channels, pulseaudio 
does not see then.

I'm running Pulseaudio on Fedora 16.

Currently I'm slighty lost, as I'm not sure if this is a driver, an alsa 
or an pulseaudio problem and how to troubleshoot this. Any help would be 
appreciated.

Regards,
Robert

[root at localhost alsa]# aplay -L
default
     Default
sysdefault:CARD=Intel
     HDA Intel, STAC92xx Analog
     Default Audio Device
front:CARD=Intel,DEV=0
     HDA Intel, STAC92xx Analog
     Front speakers
surround40:CARD=Intel,DEV=0
     HDA Intel, STAC92xx Analog
     4.0 Surround output to Front and Rear speakers
surround41:CARD=Intel,DEV=0
     HDA Intel, STAC92xx Analog
     4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Intel,DEV=0
     HDA Intel, STAC92xx Analog
     5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Intel,DEV=0
     HDA Intel, STAC92xx Analog
     5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Intel,DEV=0
     HDA Intel, STAC92xx Analog
     7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
sysdefault:CARD=DMX6FireUSB
     TerraTec DMX6FireUSB, DMX 6Fire USB Analog
     Default Audio Device
[root at localhost alsa]#

[root at localhost pulse]# aplay -l
**** Liste der Hardware-Ger?te (PLAYBACK) ****
Karte 0: Intel [HDA Intel], Ger?t 0: STAC92xx Analog [STAC92xx Analog]
   Sub-Ger?te: 1/1
   Sub-Ger?t #0: subdevice #0
Karte 1: DMX6FireUSB [TerraTec DMX6FireUSB], Ger?t 0: 6fire Analog [DMX 
6Fire USB Analog]
   Sub-Ger?te: 1/1
   Sub-Ger?t #0: subdevice #0
Karte 1: DMX6FireUSB [TerraTec DMX6FireUSB], Ger?t 1: 6fire Digital Out 
[DMX 6Fire USB Digital Playback]
   Sub-Ger?te: 1/1
   Sub-Ger?t #0: subdevice #0
[root at localhost pulse]#




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