Number of PCM instance (pcm device file) for one sound card

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Dear all , 

The tutorial below states that ""Each card device can have up to four pcm instances" 

I am getting confused with the number '4' .  I thought we can add 8 pcm device files by default.  By setting  'CONFIG_SND_DYNAMIC_MINORS=y' , we can have more than 8 pcm device files.
Does that tutorial  mean only 4 pcm devices running at the same time ?  

Thanks a lot, 

Xinhui,


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