asoundrc

# My alsa conf 

# allow dmix	my ALSA enables by default (though not with OSS emulation)

#pcm.!default {
#    type plug
#    slave.pcm "dmixer"
#}
#pcm.dsp0 {
#    type plug
#    slave.pcm "dmixer"
#}
#pcm.dmixer {
#    type dmix
#    ipc_key 1024
#    slave {
#        pcm "hw:0,0"
#        period_time 0
#        period_size 1024
#        buffer_size 8192
#        #periods 128
#        rate 44100
#     }
#     bindings {
#        0 0
#        1 1
#     }
#}
#ctl.mixer0 {
#    type hw
#    card 0
#}

# Improve capture with noise cancellation
# NB: it sounds good with >=S16_LE, but not when auto converted down to U8.
# (So use `arecord -fS16_LE`)
pcm.mic_nc {
    type plug
    slave.pcm {
	type speex
	slave.pcm {
	    type plug
	    slave.pcm dsnoop
	}
	frames 512
	denoise 1
	#agc 1
	#agc_level 8000
	#echo 1
	filter_length 8192
	dereverb 1
	#dereverb_decay 0
	#dereverb_level 0
    }
}
pcm.!default {
    type asym
    capture.pcm mic_nc
    playback.pcm cards.pcm.default
}
ctl.!default ctl.sysdefault

# ctl.!default {
#     type hw
#     card 2
# }