Dynamic device file minor numbers

configname: CONFIG_SND_DYNAMIC_MINORS

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>Dynamic device file minor numbers
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
If you say Y here, the minor numbers of ALSA device files in
/dev/snd/ are allocated dynamically. This allows you to have
more than 8 sound cards, but requires a dynamic device file
system like udev.

If you are unsure about this, say N here.