Thank you Victor for you suggestion.
I tried the same parameters as on my Linux desktop (ALSA output: total
buffer size: 1024, period size: 256)

Now, I have HW buffersize = 1024, SW = 256 (are those equivalent?) but
always an awful noise.

Besides, I noticed that when I change 
kmul = 1
by
kmul = sqrt(2)
the noise disappears.

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