The problem (or at least the first one), is the front channel DAC.
Official emu20k2 cards use CS4382 on all channels, so that's the only DAC the 
driver has code for.
Auzentech Forte has an AK4396VF on front channels, and CS4382 for other 
channels (which all work correctly).
We should be able to port code from drivers in ALSA that already handle AK4396 
(oxygen, ice1712) to get this working.

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https://bugs.launchpad.net/bugs/479377

Title:
  Auzentech X-Fi Forte 7.1 unsupported by ALSA

Status in “alsa-driver” package in Ubuntu:
  Confirmed

Bug description:
  Instead there is "0 [XFi            ]: SB-XFi - Creative X-Fi
  Creative X-Fi 20K2 Unknown" detected at the hardware test

  ProblemType: Bug
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: XFi [Creative X-Fi], device 0: ctxfi [Front/WaveIn]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  spooky     2652 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'XFi'/'Creative X-Fi 20K2 Unknown'
     Mixer name : '20K2'
     Components : ''
     Controls      : 29
     Simple ctrls  : 10
  CheckboxCommand: cat /proc/asound/cards
  CheckboxDescription:
   Ihr(e) Soundgerät(e) erkennen:
   
   $output
   
   Ist dies korrekt?
  CheckboxTest: list_audio_devices
  Date: Mon Nov  9 19:15:46 2009
  DistroRelease: Ubuntu 9.10
  Package: alsa-base 1.0.20+dfsg-1ubuntu5
  PackageArchitecture: all
  ProcEnviron:
   SHELL=/bin/bash
   LANG=de_DE.UTF-8
  ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
  SourcePackage: alsa-driver
  Tags: checkbox-bug
  Uname: Linux 2.6.31-14-generic i686
  XsessionErrors:
   (gnome-settings-daemon:2668): GLib-CRITICAL **: g_propagate_error: assertion 
`src != NULL' failed
   (gnome-settings-daemon:2668): GLib-CRITICAL **: g_propagate_error: assertion 
`src != NULL' failed
   (nautilus:2769): Eel-CRITICAL **: eel_preferences_get_boolean: assertion 
`preferences_is_initialized ()' failed
   (polkit-gnome-authentication-agent-1:2796): GLib-CRITICAL **: 
g_once_init_leave: assertion `initialization_value != 0' failed

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