Good day.

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The gusextreme driver neglects to set the gus->codec_flag meaning 
snd_gf1_pcm_new() allocates a second "PCM Playback Volume" control, 
which makes the driver fail to load.

Signed-off-by: Rene Herman <rene.herman@gmail.com>
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On top of isa_bus patch...

With this the driver works "fine" -- the es1688 bit is fine and the gf1 
bit has the same problems as gusclassic; I assume it's going to be the 
same solution as well.

Rene.