m2_g2_fs/etc/asound.conf

pcm.mixmic_1 {
	ipc_key 1026
	type dsnoop
	slave {
		pcm "hw:0"
		channels 4
		period_size 1024
		buffer_size 262144
	}
}

pcm.mixmic {
	type plug
	slave.pcm "mixmic_1"
}