Comment 9 for bug 204809

Just to clarify, the mapping at the link (for Delta 44) is valid for DMX6fire aswell. You can use that.
as the page says:

in /etc/pulse/default.pa comment out module-hal-detect and module-detect and then append lines similar to this:

# Load Dmx:
load-module module-alsa-sink sink_name=dmx_out device=hw:0 channels=10 channel_map=left,right,aux0,aux1,aux2,aux3,aux4,aux5,aux6,aux7
load-module module-alsa-source source_name=dmx_in device=hw:0 channels=12 channel_map=left,right,aux0,aux1,aux2,aux3,aux4,aux5,aux6,aux7,aux8,aux9

# Set the default sink and source
set-default-sink dmx_out
set-default-source dmx_in

Test by running pulseaudio manually.
I would suspect this to work for Roland Edirol UA-101 aswell, based on the fact that all ice1712 chipsets seem to have the same number of channels regardless actual connections.
Notice that my card is hw:0 and not hw:1, because i have disabled the onboard soundcard.

If you wish you may want to create a forum post on the ubuntu forum, as not to go too "offtopic" from this bug report.