noisy personal iris sound from /dev/audio

[Jack Jansen]

Both sound input and output are noisy on the 4D25. I get an average
of 2 bits of noise when recording with a mike that is switched off,
and an audible hiss out of the speaker even when the output gain is set
to zero (it is worse with non-zero gain, obviously).

Everything the machine does effects the noise (moving the mouse,
computations, network traffic), so I assume that it is not a question
of improper shielding, but more one of coupling through the power
supply.

I guess they should market it as 'a 6 bit audio interface' in stead
of an 8 bit one. I'll just wait for my 4D35 to arrive before doing
any real audio work. The quality is good enough for my audio-biff, though.
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