!!################################
!!ALSA Information Script v 0.5.1
!!################################

!!Script ran on: Thu Nov 14 22:15:03 UTC 2024


!!Linux Distribution
!!------------------

Debian GNU/Linux 12 \n \l PRETTY_NAME="Debian GNU/Linux 12 (bookworm)" NAME="Debian GNU/Linux" ID=debian HOME_URL="https://www.debian.org/" SUPPORT_URL="https://www.debian.org/support" BUG_REPORT_URL="https://bugs.debian.org/"


!!DMI Information
!!---------------

Manufacturer:      
Product Name:      
Product Version:   
Firmware Version:  
System SKU:        
Board Vendor:      
Board Name:        


!!ACPI Device Status Information
!!---------------



!!Kernel Information
!!------------------

Kernel release:    6.6.56-current-rockchip64
Operating System:  GNU/Linux
Architecture:      aarch64
Processor:         unknown
SMP Enabled:       Yes


!!ALSA Version
!!------------

Driver version:     k6.6.56-current-rockchip64
Library version:    1.2.8
Utilities version:  1.2.8


!!Loaded ALSA modules
!!-------------------

snd_soc_audio_graph_card (card 0)
snd_soc_simple_card (card 1)


!!Sound Servers on this system
!!----------------------------

No sound servers found.


!!Soundcards recognised by ALSA
!!-----------------------------

 0 [Analog         ]: Analog - Analog
                      Analog
 1 [hdmisound      ]: simple-card - hdmi-sound
                      hdmi-sound


!!Modprobe options (Sound related)
!!--------------------------------

snd_pcsp: index=-2
snd_atiixp_modem: index=-2
snd_intel8x0m: index=-2
snd_via82xx_modem: index=-2


!!Loaded sound module options
!!---------------------------

!!Module: snd_soc_audio_graph_card
	* : 

!!Module: snd_soc_simple_card
	* : 


!!Sysfs card info
!!---------------

!!Card: /sys/class/sound/card0
Driver: /sys/bus/platform/drivers/asoc-audio-graph-card
Tree:

!!Card: /sys/class/sound/card1
Driver: /sys/bus/platform/drivers/asoc-simple-card
Tree:


!!ALSA Device nodes
!!-----------------

crw-rw---- 1 root audio 116,  0 Nov 11 21:27 /dev/snd/controlC0
crw-rw---- 1 root audio 116, 32 Nov 11 21:27 /dev/snd/controlC1
crw-rw---- 1 root audio 116, 24 Nov 11 21:27 /dev/snd/pcmC0D0c
crw-rw---- 1 root audio 116, 16 Nov 11 21:27 /dev/snd/pcmC0D0p
crw-rw---- 1 root audio 116, 56 Nov 11 21:27 /dev/snd/pcmC1D0c
crw-rw---- 1 root audio 116, 48 Nov 11 21:27 /dev/snd/pcmC1D0p
crw-rw---- 1 root audio 116,  1 Nov 11 21:27 /dev/snd/seq
crw-rw---- 1 root audio 116, 33 Nov 11 21:27 /dev/snd/timer

/dev/snd/by-path:
total 0
drwxr-xr-x 2 root root  80 Nov 11 21:27 .
drwxr-xr-x 3 root root 220 Nov 11 21:27 ..
lrwxrwxrwx 1 root root  12 Nov 11 21:27 platform-hdmi-sound -> ../controlC1
lrwxrwxrwx 1 root root  12 Nov 11 21:27 platform-sound -> ../controlC0


!!ALSA configuration files
!!------------------------

!!System wide config file (/etc/asound.conf)

pcm.!default {
	type hw
	card 0
	device 0
}

ctl.!default {
	type hw
	card 0
}


!!Aplay/Arecord output
!!--------------------

APLAY

**** List of PLAYBACK Hardware Devices ****
card 0: Analog [Analog], device 0: ff880000.i2s-ES8316 HiFi ES8316 HiFi-0 [ff880000.i2s-ES8316 HiFi ES8316 HiFi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: hdmisound [hdmi-sound], device 0: ff8a0000.i2s-i2s-hifi i2s-hifi-0 [ff8a0000.i2s-i2s-hifi i2s-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

ARECORD

**** List of CAPTURE Hardware Devices ****
card 0: Analog [Analog], device 0: ff880000.i2s-ES8316 HiFi ES8316 HiFi-0 [ff880000.i2s-ES8316 HiFi ES8316 HiFi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: hdmisound [hdmi-sound], device 0: ff8a0000.i2s-i2s-hifi i2s-hifi-0 [ff8a0000.i2s-i2s-hifi i2s-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

!!Amixer output
!!-------------

!!-------Mixer controls for card Analog

Card sysdefault:0 'Analog'/'Analog'
  Mixer name	: ''
  Components	: ''
  Controls      : 35
  Simple ctrls  : 35
Simple mixer control 'Headphone',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 3
  Mono:
  Front Left: Playback 3 [100%] [0.00dB]
  Front Right: Playback 3 [100%] [0.00dB]
Simple mixer control 'Headphone Mixer',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 11
  Front Left: 0 [0%] [-12.00dB]
  Front Right: 0 [0%] [-12.00dB]
Simple mixer control 'Mic Boost',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'Playback Polarity',0
  Capabilities: enum
  Items: 'Normal' 'R Invert' 'L Invert' 'L   R Invert'
  Item0: 'Normal'
Simple mixer control 'Capture Polarity',0
  Capabilities: enum
  Items: 'Normal' 'Invert'
  Item0: 'Normal'
Simple mixer control 'ADC',0
  Capabilities: cvolume cvolume-joined
  Capture channels: Mono
  Limits: Capture 0 - 192
  Mono: Capture 0 [0%] [-99999.99dB]
Simple mixer control 'ADC Double Fs',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'ADC PGA Gain',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 10
  Mono: 0 [0%] [-3.50dB]
Simple mixer control 'ADC Soft Ramp',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'ALC',0
  Capabilities: cswitch cswitch-joined
  Capture channels: Mono
  Mono: Capture [off]
Simple mixer control 'ALC Capture Attack Time',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 10
  Mono: 1 [10%]
Simple mixer control 'ALC Capture Decay Time',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 10
  Mono: 3 [30%]
Simple mixer control 'ALC Capture Hold Time',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 10
  Mono: 0 [0%]
Simple mixer control 'ALC Capture Max',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 28
  Mono: 0 [0%] [-6.50dB]
Simple mixer control 'ALC Capture Min',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 28
  Mono: 0 [0%] [-12.00dB]
Simple mixer control 'ALC Capture Noise Gate',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'ALC Capture Noise Gate Threshold',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 31
  Mono: 0 [0%]
Simple mixer control 'ALC Capture Noise Gate Type',0
  Capabilities: enum
  Items: 'Constant PGA Gain' 'Mute ADC Output'
  Item0: 'Mute ADC Output'
Simple mixer control 'ALC Capture Target',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 11
  Mono: 11 [100%] [-1.50dB]
Simple mixer control 'DAC',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 192
  Mono:
  Front Left: Playback 152 [79%] [-20.00dB]
  Front Right: Playback 152 [79%] [-20.00dB]
Simple mixer control 'DAC Double Fs',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'DAC Mono Mix',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'DAC Notch Filter',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'DAC Soft Ramp',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'DAC Soft Ramp Rate',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 4
  Mono: 0 [0%]
Simple mixer control 'DAC Source Mux',0
  Capabilities: enum
  Items: 'LDATA TO LDAC, RDATA TO RDAC' 'LDATA TO LDAC, LDATA TO RDAC' 'RDATA TO LDAC, RDATA TO RDAC' 'RDATA TO LDAC, LDATA TO RDAC'
  Item0: 'LDATA TO LDAC, RDATA TO RDAC'
Simple mixer control 'DAC Stereo Enhancement',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 7
  Mono: 0 [0%]
Simple mixer control 'Differential Mux',0
  Capabilities: enum
  Items: 'lin1-rin1' 'lin2-rin2' 'lin1-rin1 with 20db Boost' 'lin2-rin2 with 20db Boost'
  Item0: 'lin1-rin1'
Simple mixer control 'Digital Mic Mux',0
  Capabilities: enum
  Items: 'dmic disable' 'dmic data at high level' 'dmic data at low level'
  Item0: 'dmic disable'
Simple mixer control 'Left Headphone Mixer LLIN',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'Left Headphone Mixer Left DAC',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'Left Headphone Mux',0
  Capabilities: enum
  Items: 'lin1-rin1' 'lin2-rin2' 'lin-rin with Boost' 'lin-rin with Boost and PGA'
  Item0: 'lin1-rin1'
Simple mixer control 'Right Headphone Mixer RLIN',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'Right Headphone Mixer Right DAC',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'Right Headphone Mux',0
  Capabilities: enum
  Items: 'lin1-rin1' 'lin2-rin2' 'lin-rin with Boost' 'lin-rin with Boost and PGA'
  Item0: 'lin1-rin1'

!!-------Mixer controls for card hdmisound

Card sysdefault:1 'hdmisound'/'hdmi-sound'
  Mixer name	: ''
  Components	: ''
  Controls      : 4
  Simple ctrls  : 0


!!Alsactl output
!!--------------

--startcollapse--
state.Analog {
	control.1 {
		iface MIXER
		name 'Headphone Playback Volume'
		value.0 3
		value.1 3
		comment {
			access 'read write'
			type INTEGER
			count 2
			range '0 - 3'
			dbmin -4800
			dbmax 0
			dbvalue.0 0
			dbvalue.1 0
		}
	}
	control.2 {
		iface MIXER
		name 'Headphone Mixer Volume'
		value.0 0
		value.1 0
		comment {
			access 'read write'
			type INTEGER
			count 2
			range '0 - 11'
			dbmin -1200
			dbmax 0
			dbvalue.0 -1200
			dbvalue.1 -1200
		}
	}
	control.3 {
		iface MIXER
		name 'Playback Polarity'
		value Normal
		comment {
			access 'read write'
			type ENUMERATED
			count 1
			item.0 Normal
			item.1 'R Invert'
			item.2 'L Invert'
			item.3 'L   R Invert'
		}
	}
	control.4 {
		iface MIXER
		name 'DAC Playback Volume'
		value.0 152
		value.1 152
		comment {
			access 'read write'
			type INTEGER
			count 2
			range '0 - 192'
			dbmin -9999999
			dbmax 0
			dbvalue.0 -2000
			dbvalue.1 -2000
		}
	}
	control.5 {
		iface MIXER
		name 'DAC Soft Ramp Switch'
		value true
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.6 {
		iface MIXER
		name 'DAC Soft Ramp Rate'
		value 0
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 4'
		}
	}
	control.7 {
		iface MIXER
		name 'DAC Notch Filter Switch'
		value true
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.8 {
		iface MIXER
		name 'DAC Double Fs Switch'
		value true
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.9 {
		iface MIXER
		name 'DAC Stereo Enhancement'
		value 0
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 7'
		}
	}
	control.10 {
		iface MIXER
		name 'DAC Mono Mix Switch'
		value false
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.11 {
		iface MIXER
		name 'Capture Polarity'
		value Normal
		comment {
			access 'read write'
			type ENUMERATED
			count 1
			item.0 Normal
			item.1 Invert
		}
	}
	control.12 {
		iface MIXER
		name 'Mic Boost Switch'
		value false
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.13 {
		iface MIXER
		name 'ADC Capture Volume'
		value 0
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 192'
			dbmin -9999999
			dbmax 0
			dbvalue.0 -9999999
		}
	}
	control.14 {
		iface MIXER
		name 'ADC PGA Gain Volume'
		value 0
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 10'
			dbmin -350
			dbmax 2400
			dbvalue.0 -350
		}
	}
	control.15 {
		iface MIXER
		name 'ADC Soft Ramp Switch'
		value true
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.16 {
		iface MIXER
		name 'ADC Double Fs Switch'
		value false
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.17 {
		iface MIXER
		name 'ALC Capture Switch'
		value false
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.18 {
		iface MIXER
		name 'ALC Capture Max Volume'
		value 0
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 28'
			dbmin -650
			dbmax 3550
			dbvalue.0 -650
		}
	}
	control.19 {
		iface MIXER
		name 'ALC Capture Min Volume'
		value 0
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 28'
			dbmin -1200
			dbmax 3000
			dbvalue.0 -1200
		}
	}
	control.20 {
		iface MIXER
		name 'ALC Capture Target Volume'
		value 11
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 11'
			dbmin -1650
			dbmax -150
			dbvalue.0 -150
		}
	}
	control.21 {
		iface MIXER
		name 'ALC Capture Hold Time'
		value 0
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 10'
		}
	}
	control.22 {
		iface MIXER
		name 'ALC Capture Decay Time'
		value 3
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 10'
		}
	}
	control.23 {
		iface MIXER
		name 'ALC Capture Attack Time'
		value 1
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 10'
		}
	}
	control.24 {
		iface MIXER
		name 'ALC Capture Noise Gate Switch'
		value false
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.25 {
		iface MIXER
		name 'ALC Capture Noise Gate Threshold'
		value 0
		comment {
			access 'read write'
			type INTEGER
			count 1
			range '0 - 31'
		}
	}
	control.26 {
		iface MIXER
		name 'ALC Capture Noise Gate Type'
		value 'Mute ADC Output'
		comment {
			access 'read write'
			type ENUMERATED
			count 1
			item.0 'Constant PGA Gain'
			item.1 'Mute ADC Output'
		}
	}
	control.27 {
		iface MIXER
		name 'Differential Mux'
		value lin1-rin1
		comment {
			access 'read write'
			type ENUMERATED
			count 1
			item.0 lin1-rin1
			item.1 lin2-rin2
			item.2 'lin1-rin1 with 20db Boost'
			item.3 'lin2-rin2 with 20db Boost'
		}
	}
	control.28 {
		iface MIXER
		name 'Digital Mic Mux'
		value 'dmic disable'
		comment {
			access 'read write'
			type ENUMERATED
			count 1
			item.0 'dmic disable'
			item.1 'dmic data at high level'
			item.2 'dmic data at low level'
		}
	}
	control.29 {
		iface MIXER
		name 'DAC Source Mux'
		value 'LDATA TO LDAC, RDATA TO RDAC'
		comment {
			access 'read write'
			type ENUMERATED
			count 1
			item.0 'LDATA TO LDAC, RDATA TO RDAC'
			item.1 'LDATA TO LDAC, LDATA TO RDAC'
			item.2 'RDATA TO LDAC, RDATA TO RDAC'
			item.3 'RDATA TO LDAC, LDATA TO RDAC'
		}
	}
	control.30 {
		iface MIXER
		name 'Left Headphone Mux'
		value lin1-rin1
		comment {
			access 'read write'
			type ENUMERATED
			count 1
			item.0 lin1-rin1
			item.1 lin2-rin2
			item.2 'lin-rin with Boost'
			item.3 'lin-rin with Boost and PGA'
		}
	}
	control.31 {
		iface MIXER
		name 'Right Headphone Mux'
		value lin1-rin1
		comment {
			access 'read write'
			type ENUMERATED
			count 1
			item.0 lin1-rin1
			item.1 lin2-rin2
			item.2 'lin-rin with Boost'
			item.3 'lin-rin with Boost and PGA'
		}
	}
	control.32 {
		iface MIXER
		name 'Left Headphone Mixer LLIN Switch'
		value false
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.33 {
		iface MIXER
		name 'Left Headphone Mixer Left DAC Switch'
		value true
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.34 {
		iface MIXER
		name 'Right Headphone Mixer RLIN Switch'
		value false
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.35 {
		iface MIXER
		name 'Right Headphone Mixer Right DAC Switch'
		value true
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
}
state.hdmisound {
	control.1 {
		iface PCM
		name 'Playback Channel Map'
		value.0 0
		value.1 0
		value.2 0
		value.3 0
		value.4 0
		value.5 0
		value.6 0
		value.7 0
		comment {
			access read
			type INTEGER
			count 8
			range '0 - 36'
		}
	}
	control.2 {
		iface PCM
		name 'IEC958 Playback Mask'
		value ffffffffffffffffffffffffffffffffffffffffffffffff0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
		comment {
			access read
			type IEC958
			count 1
		}
	}
	control.3 {
		iface PCM
		name 'IEC958 Playback Default'
		value '0400000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
		comment {
			access 'read write'
			type IEC958
			count 1
		}
	}
	control.4 {
		iface PCM
		name ELD
		value '0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
		comment {
			access 'read volatile'
			type BYTES
			count 128
		}
	}
}
--endcollapse--


!!All Loaded Modules
!!------------------

auth_rpcgss
autofs4
binfmt_misc
bluetooth
brcmfmac
brcmutil
bridge
btsdio
cfg80211
cpufreq_dt
dm_mod
drm_shmem_helper
dw_hdmi_cec
dw_hdmi_i2s_audio
dwmac_rk
fscache
gpu_sched
grace
hantro_vpu
ip6_udp_tunnel
ip_tables
libchacha20poly1305
libcurve25519_generic
lockd
mc
netfs
nf_conntrack
nf_conntrack_netlink
nf_defrag_ipv4
nf_defrag_ipv6
nf_nat
nf_tables
nfnetlink
nfs
nfs_acl
nfsd
nfsv4
nft_chain_nat
nft_compat
nft_ct
nft_fib
nft_fib_ipv4
panfrost
pcs_xpcs
poly1305_neon
realtek
rfkill
rk_crypto
rng_core
rockchip_rga
rockchip_vdec
rpcsec_gss_krb5
snd
snd_compress
snd_pcm
snd_pcm_dmaengine
snd_soc_audio_graph_card
snd_soc_core
snd_soc_es8316
snd_soc_hdmi_codec
snd_soc_rockchip_i2s
snd_soc_simple_card
snd_soc_simple_card_utils
snd_soc_spdif_tx
snd_timer
soundcore
stmmac
stmmac_platform
sunrpc
udp_tunnel
v4l2_h264
v4l2_mem2mem
v4l2_vp9
veth
videobuf2_common
videobuf2_dma_contig
videobuf2_dma_sg
videobuf2_memops
videobuf2_v4l2
videodev
wireguard
x_tables
xfrm_algo
xfrm_user
xt_MASQUERADE
xt_addrtype
xt_comment
xt_connmark
xt_conntrack
xt_mark
xt_nat
xt_tcpudp


!!ALSA/HDA dmesg
!!--------------

[    3.373665] rockchip-drm display-subsystem: bound ff900000.vop (ops 0xffff8000811d6b00)
[    3.374876] dwhdmi-rockchip ff940000.hdmi: Detected HDMI TX controller v2.11a with HDCP (DWC HDMI 2.0 TX PHY)
[    3.377469] rockchip-drm display-subsystem: bound ff940000.hdmi (ops 0xffff8000811dad40)
--
[   19.330055] br-1786e962d55a: port 1(veth30b4b40) entered forwarding state
[   19.425952] platform sound-dit: deferred probe pending
[  407.937325] systemd[1]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set


!!Packages installed
!!--------------------

ii  alsa-utils                     1.2.8-1                        arm64        Utilities for configuring and using ALSA