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[SOLVED] Hardware Volume on RPi DigiAMP+ and DAC Pro - Printable Version

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+--- Thread: [SOLVED] Hardware Volume on RPi DigiAMP+ and DAC Pro (/showthread.php?tid=7375)

Hardware Volume on RPi DigiAMP+ and DAC Pro - tropappar - 02-01-2025

Hello,

I'm trying to get the hardware volume to work on my Raspberry Pi 3 with the DigiAMP+. For one, the old IQaudIO guide states that I should use hardware volume. But also I need it for multiroom.

However, when switching to hardware volume, I experience a strange behavior:
  • Volume 0-49 results in -6dB
  • Volume 50 and up results in 0dB
So basically always extremely loud.

When I export the moOde settings with moodeutl I see that the amixname is set to Analogue.

When I run the alsamixer -c 1 (1 is the DigiAMP+ card), I see the Analogue mixer behaves exactly as described above: jumping only between -6dB and 0dB. However, there is also a Digital mixer which behaves very nicely.

This brings me to my question: How can I switch the mixer?

I experience the exact same behavior with the DAC Pro.

Here is the output of moodeutl -l:


Code:
20250201 205854 worker: --
20250201 205854 worker: -- Start moOde 9 series
20250201 205854 worker: --
20250201 205854 worker: Daemonize:     complete
20250201 205854 worker: Linux startup: complete
20250201 205854 worker: Boot config:   ok
20250201 205854 worker: Boot folder:   ok
20250201 205854 worker: Radio table:   ok
20250201 205856 worker: PHP session:   cleaned
20250201 205856 worker: PHP session:   loaded
20250201 205900 worker: Package locks: applied
20250201 205902 worker: File check:    complete
20250201 205902 worker: Log to RAM:    on
20250201 205902 worker: Debug logging: off
20250201 205902 worker: --
20250201 205902 worker: -- System
20250201 205902 worker: --
20250201 205905 worker: Host name:     [removed]
20250201 205905 worker: RPi model:     Pi-3A+ 1.1 512MB
20250201 205905 worker: moOde release: 9.2.3 2025-01-21
20250201 205905 worker: RaspiOS:       12.9 Bookworm 64-bit
20250201 205905 worker: Linux Kernel:  6.6.62 64-bit
20250201 205905 worker: MPD version:   0.23.14
20250201 205905 worker: User id:       [removed]
20250201 205905 worker: Home folder:   [removed]
20250201 205905 worker: Time zone:     Europe/Vienna
20250201 205905 worker: Kbd layout:    de
20250201 205905 worker: HDMI ports(s): on
20250201 205905 worker: HDMI-CEC:      off
20250201 205905 worker: Sys LED0:      on
20250201 205905 worker: Sys LED1:      on
20250201 205905 worker: Reduce power:  n/a
20250201 205905 worker: Fan control:   n/a
20250201 205905 worker: CPU governor:  ondemand
20250201 205905 worker: Integ audio:   vc4-kms-v3d
20250201 205905 worker: --
20250201 205905 worker: -- Network
20250201 205905 worker: --
20250201 205905 worker: Eth0
20250201 205905 worker: Ethernet: adapter does not exist
20250201 205905 worker: Wlan0
20250201 205905 worker: Wireless: adapter exists
20250201 205905 worker: Wireless: country AT
20250201 205905 worker: Wireless: SSID    [removed]
20250201 205905 worker: Wireless: other   None
20250201 205905 worker: Wireless: timeout up to 90 secs
20250201 205906 worker: Wireless: connect to [removed]
20250201 205906 worker: Wireless: method  dhcp
20250201 205906 worker: Wireless: address 192.168.1.33
20250201 205906 worker: Wireless: netmask 255.255.255.0
20250201 205906 worker: Wireless: gateway 192.168.1.1
20250201 205906 worker: Wireless: pri DNS 192.168.1.10
20250201 205906 worker: Wireless: domain  [removed]
20250201 205906 worker: --
20250201 205906 worker: -- File sharing
20250201 205906 worker: --
20250201 205906 worker: SMB file sharing:  off
20250201 205906 worker: SMB password:      none
20250201 205906 worker: NFS file sharing:  off
20250201 205906 worker: DLNA file sharing: off
20250201 205906 worker: --
20250201 205906 worker: -- Special configs
20250201 205906 worker: --
20250201 205906 worker: Plexamp:          not installed
20250201 205906 worker: RoonBridge:       not installed
20250201 205906 worker: Allo Boss 2:      not detected, OLED script ok
20250201 205906 worker: Allo Piano 2.1:   not detected
20250201 205906 worker: IQaudIO AMP*:     not detected
20250201 205906 worker: Bluetooth:        session vars ok
20250201 205906 worker: --
20250201 205906 worker: -- ALSA debug
20250201 205906 worker: --
20250201 205906 worker: Cards:  0:vc4hdmi         1:DigiAMP         2:empty           3:empty           
20250201 205906 worker:         4:empty           5:empty           6:empty           7:empty           
20250201 205906 worker: Mixers: 0:none            1:(Digital)       2:none            3:none            
20250201 205906 worker:         4:none            5:none            6:none            7:none            
20250201 205906 worker: --
20250201 205906 worker: -- Audio configuration
20250201 205906 worker: --
20250201 205906 worker: Audio device:  1:RPi DigiAMP+
20250201 205906 worker: ALSA card:     has not been reassigned
20250201 205906 worker: MPD config:    update not needed
20250201 205907 worker: ALSA output:   USB
20250201 205907 worker: ALSA mode:     Default (plughw)
20250201 205907 worker: ALSA mixer:    Analogue
20250201 205907 worker: ALSA volume:   100% (0.00dB)
20250201 205907 worker: ALSA maxvol:   20%
20250201 205907 worker: ALSA loopback: off
20250201 205907 worker: MPD mixer      Hardware
20250201 205907 worker: Audio formats: S16_LE, S24_LE, S32_LE
20250201 205907 worker: CamillaDSP:    off
20250201 205907 worker: CDSP volume:   0dB
20250201 205907 worker: CDSP volrange: 60dB
20250201 205907 worker: --
20250201 205907 worker: -- MPD startup
20250201 205907 worker: --
20250201 205908 worker: MPD service:        started
20250201 205908 worker: MPD port 6600:      accepting connections
20250201 205908 worker: MPD ALSA Default:   on
20250201 205908 worker: MPD ALSA Bluetooth: off
20250201 205908 worker: MPD HTTP Server:    off
20250201 205908 worker: MPD volume:         64
20250201 205908 worker: Saved MPD vol:      -1
20250201 205908 worker: Saved SRC vol:      0
20250201 205908 worker: MPD crossfade:      off
20250201 205908 worker: MPD ignore CUE:     no
20250201 205908 worker: MPD CDSP volsync:   off
20250201 205908 worker: --
20250201 205908 worker: -- Music sources
20250201 205908 worker: --
20250201 205908 worker: USB drives:     none
20250201 205908 worker: NVMe drives:    none
20250201 205908 worker: SATA drives:    none
20250201 205908 worker: NAS sources:    none
20250201 205908 worker: --
20250201 205908 worker: -- Feature availability
20250201 205908 worker: --
20250201 205908 worker: Input select:    available, Source: MPD, Output: RPi DigiAMP+
20250201 205908 worker: Bluetooth:       available, PIN: None, ALSA/CDSP maxvol: 100%/0dB, ALSA outmode: Standard
20250201 205908 worker: AirPlay:         available
20250201 205908 worker: Spotify Connect: started
20250201 205908 worker: Deezer Connect:  available
20250201 205908 worker: Squeezelite:     available
20250201 205908 worker: UPnP client:     available
20250201 205908 worker: Plexamp:         not installed, ALSA maxvol: 100%
20250201 205908 worker: RoonBridge:      not installed
20250201 205908 worker: Multiroom:       available
20250201 205908 worker: GPIO buttons:    available
20250201 205908 worker: Stream recorder: n/a
20250201 205908 worker: --
20250201 205908 worker: -- Security
20250201 205908 worker: --
20250201 205908 worker: Web SSH server:    off
20250201 205908 worker: XSS detection:     off
20250201 205908 worker: HTTPS mode:        available
20250201 205908 worker: --
20250201 205908 worker: -- Peripherals
20250201 205908 worker: --
20250201 205927 worker: Local display:   off
20250201 205927 worker: Chromium ver:    126.0.6478.164-rpt1
20250201 205927 worker: Chromium cfg:    directory ok
20250201 205927 worker: Screen blank     600
20250201 205927 worker: On-screen kbd:   off
20250201 205927 worker: Disable GPU:     off
20250201 205927 worker: HDMI orient:     landscape
20250201 205927 worker: HDMI 4K 60Hz:    off
20250201 205927 worker: DSI scn type:    none
20250201 205927 worker: DSI port:        1
20250201 205927 worker: DSI brightness:  255
20250201 205927 worker: DSI rotate:      0
20250201 205927 worker: Rotary encoder:  off
20250201 205927 worker: USB volume knob: off
20250201 205927 worker: LCD updater:     off
20250201 205927 worker: --
20250201 205927 worker: -- Miscellaneous
20250201 205927 worker: --
20250201 205927 worker: Software update:   Automatic check on
20250201 205927 worker: Software update:   Checking for available update...
20250201 205928 worker: Software update:   Software is up to date
20250201 205928 worker: Auto-CoverView:    off
20250201 205928 worker: CoverView timeout: Never
20250201 205928 worker: Auto-shuffle:      off
20250201 205928 worker: Auto-play:         off
20250201 205928 worker: Maintenance task:  360 mins
20250201 205928 worker: Current view:      reset to Playback
20250201 205928 worker: Active flags:      all false
20250201 205928 worker: Reset flags:       skipped
20250201 205929 worker: Session check:     ok
20250201 205929 worker: --
20250201 205929 worker: -- Startup complete
20250201 205929 worker: --
20250201 205929 worker: Mount monitor:    started
20250201 205929 worker: Radio monitor:    off
20250201 205929 worker: Watchdog monitor: started
20250201 205929 worker: Responsiveness:   Default
20250201 205929 worker: Ready
20250201 210936 worker: Job mpdcfg


RE: Hardware Volume on RPi DigiAMP+ and DAC Pro - Tim Curtis - 02-01-2025

This section shows some breakage.

20250201 205906 worker: Audio device:  1:RPi DigiAMP+
20250201 205906 worker: ALSA card:     has not been reassigned
20250201 205906 worker: MPD config:    update not needed
20250201 205907 worker: ALSA output:   USB

In Audio Config did you set "Named I2S device" to "Raspberry Pi DigiAMP+" ??

RE: Hardware Volume on RPi DigiAMP+ and DAC Pro - tropappar - 02-02-2025

(02-01-2025, 09:52 PM)Tim Curtis Wrote: In Audio Config did you set "Named I2S device" to "Raspberry Pi DigiAMP+" ??

No, I did not set "Named I2S device" (see first screenshot). Everything was working fine with software volume but not hardware volume (as explained above).

I tried setting  "Named I2S device" to "Raspberry Pi DigiAMP+"  (see second screenshot). Now I don't have any audio output at all.

Again, I attach the log for after setting the I2S device:


Code:
20250202 120543 worker: --
20250202 120544 worker: -- Start moOde 9 series
20250202 120544 worker: --
20250202 120544 worker: Daemonize:     complete
20250202 120550 worker: Linux startup: complete
20250202 120550 worker: Boot config:   ok
20250202 120550 worker: Boot folder:   ok
20250202 120550 worker: Radio table:   ok
20250202 120552 worker: PHP session:   cleaned
20250202 120552 worker: PHP session:   loaded
20250202 120557 worker: Package locks: applied
20250202 120558 worker: File check:    complete
20250202 120558 worker: Log to RAM:    on
20250202 120558 worker: Debug logging: off
20250202 120558 worker: --
20250202 120558 worker: -- System
20250202 120558 worker: --
20250202 120600 worker: Host name:     [removed]
20250202 120600 worker: RPi model:     Pi-3A+ 1.1 512MB
20250202 120601 worker: moOde release: 9.2.3 2025-01-21
20250202 120601 worker: RaspiOS:       12.9 Bookworm 64-bit
20250202 120601 worker: Linux Kernel:  6.6.62 64-bit
20250202 120601 worker: MPD version:   0.23.14
20250202 120601 worker: User id:       [removed]
20250202 120601 worker: Home folder:   [removed]
20250202 120601 worker: Time zone:     Europe/Vienna
20250202 120601 worker: Kbd layout:    de
20250202 120601 worker: HDMI ports(s): on
20250202 120601 worker: HDMI-CEC:      off
20250202 120601 worker: Sys LED0:      on
20250202 120601 worker: Sys LED1:      on
20250202 120601 worker: Reduce power:  n/a
20250202 120601 worker: Fan control:   n/a
20250202 120601 worker: CPU governor:  ondemand
20250202 120601 worker: Integ audio:   vc4-kms-v3d
20250202 120601 worker: --
20250202 120601 worker: -- Network
20250202 120601 worker: --
20250202 120601 worker: Eth0
20250202 120601 worker: Ethernet: adapter does not exist
20250202 120601 worker: Wlan0
20250202 120601 worker: Wireless: adapter exists
20250202 120601 worker: Wireless: country AT
20250202 120601 worker: Wireless: SSID    [removed]
20250202 120601 worker: Wireless: other   None
20250202 120601 worker: Wireless: timeout up to 90 secs
20250202 120602 worker: Wireless: connect to [removed]
20250202 120602 worker: Wireless: method  dhcp
20250202 120602 worker: Wireless: address 192.168.1.33
20250202 120602 worker: Wireless: netmask 255.255.255.0
20250202 120602 worker: Wireless: gateway 192.168.1.1
20250202 120602 worker: Wireless: pri DNS 192.168.1.10
20250202 120602 worker: Wireless: domain  [removed]
20250202 120602 worker: --
20250202 120602 worker: -- File sharing
20250202 120602 worker: --
20250202 120602 worker: SMB file sharing:  off
20250202 120602 worker: SMB password:      none
20250202 120602 worker: NFS file sharing:  off
20250202 120602 worker: DLNA file sharing: off
20250202 120602 worker: --
20250202 120602 worker: -- Special configs
20250202 120602 worker: --
20250202 120602 worker: Plexamp:          not installed
20250202 120602 worker: RoonBridge:       not installed
20250202 120602 worker: Allo Boss 2:      not detected, OLED script ok
20250202 120602 worker: Allo Piano 2.1:   not detected
20250202 120602 worker: IQaudIO AMP*:     not detected
20250202 120602 worker: Bluetooth:        session vars ok
20250202 120602 worker: --
20250202 120602 worker: -- ALSA debug
20250202 120602 worker: --
20250202 120602 worker: Cards:  0:vc4hdmi         1:DigiAMP         2:empty           3:empty          
20250202 120602 worker:         4:empty           5:empty           6:empty           7:empty          
20250202 120602 worker: Mixers: 0:none            1:(Digital)       2:none            3:none            
20250202 120602 worker:         4:none            5:none            6:none            7:none            
20250202 120602 worker: --
20250202 120602 worker: -- Audio configuration
20250202 120602 worker: --
20250202 120602 worker: Audio device:  1:Raspberry Pi DigiAMP+
20250202 120602 worker: ALSA card:     has not been reassigned
20250202 120602 worker: MPD config:    update not needed
20250202 120603 worker: ALSA output:   I2S
20250202 120603 worker: ALSA mode:     Default (plughw)
20250202 120603 worker: ALSA mixer:    Digital
20250202 120615 worker: ALSA volume:   100% (0.00dB)
20250202 120615 worker: ALSA maxvol:   100%
20250202 120615 worker: ALSA loopback: off
20250202 120615 worker: MPD mixer      Software
20250202 120616 worker: Audio formats: S16_LE, S24_LE, S32_LE
20250202 120616 worker: CamillaDSP:    off
20250202 120616 worker: CDSP volume:   0dB
20250202 120616 worker: CDSP volrange: 60dB
20250202 120616 worker: --
20250202 120616 worker: -- MPD startup
20250202 120616 worker: --
20250202 120616 worker: MPD service:        started
20250202 120616 worker: MPD port 6600:      accepting connections
20250202 120617 worker: MPD ALSA Default:   on
20250202 120617 worker: MPD ALSA Bluetooth: off
20250202 120617 worker: MPD HTTP Server:    off
20250202 120617 worker: MPD volume:         34
20250202 120617 worker: Saved MPD vol:      -1
20250202 120617 worker: Saved SRC vol:      0
20250202 120617 worker: MPD crossfade:      off
20250202 120617 worker: MPD ignore CUE:     no
20250202 120617 worker: MPD CDSP volsync:   off
20250202 120617 worker: --
20250202 120617 worker: -- Music sources
20250202 120617 worker: --
20250202 120617 worker: USB drives:     none
20250202 120617 worker: NVMe drives:    none
20250202 120617 worker: SATA drives:    none
20250202 120617 worker: NAS sources:    none
20250202 120617 worker: --
20250202 120617 worker: -- Feature availability
20250202 120617 worker: --
20250202 120617 worker: Input select:    available, Source: MPD, Output: Raspberry Pi DigiAMP+
20250202 120617 worker: Bluetooth:       available, PIN: None, ALSA/CDSP maxvol: 100%/0dB, ALSA outmode: Standard
20250202 120617 worker: AirPlay:         available
20250202 120617 worker: Spotify Connect: started
20250202 120617 worker: Deezer Connect:  available
20250202 120617 worker: Squeezelite:     available
20250202 120617 worker: UPnP client:     available
20250202 120617 worker: Plexamp:         not installed, ALSA maxvol: 100%
20250202 120617 worker: RoonBridge:      not installed
20250202 120617 worker: Multiroom:       available
20250202 120617 worker: GPIO buttons:    available
20250202 120617 worker: Stream recorder: n/a
20250202 120617 worker: --
20250202 120617 worker: -- Security
20250202 120617 worker: --
20250202 120617 worker: Web SSH server:    off
20250202 120617 worker: XSS detection:     off
20250202 120617 worker: HTTPS mode:        available
20250202 120617 worker: --
20250202 120617 worker: -- Peripherals
20250202 120617 worker: --
20250202 120624 worker: Local display:   off
20250202 120624 worker: Chromium ver:    126.0.6478.164-rpt1
20250202 120624 worker: Chromium cfg:    directory ok
20250202 120624 worker: Screen blank     600
20250202 120624 worker: On-screen kbd:   off
20250202 120624 worker: Disable GPU:     off
20250202 120624 worker: HDMI orient:     landscape
20250202 120624 worker: HDMI 4K 60Hz:    off
20250202 120624 worker: DSI scn type:    none
20250202 120624 worker: DSI port:        1
20250202 120624 worker: DSI brightness:  255
20250202 120624 worker: DSI rotate:      0
20250202 120624 worker: Rotary encoder:  off
20250202 120624 worker: USB volume knob: off
20250202 120624 worker: LCD updater:     off
20250202 120624 worker: --
20250202 120624 worker: -- Miscellaneous
20250202 120624 worker: --
20250202 120624 worker: Software update:   Automatic check on
20250202 120624 worker: Software update:   Checking for available update...
20250202 120625 worker: Software update:   Software is up to date
20250202 120625 worker: Auto-CoverView:    off
20250202 120625 worker: CoverView timeout: Never
20250202 120625 worker: Auto-shuffle:      off
20250202 120625 worker: Auto-play:         off
20250202 120625 worker: Maintenance task:  360 mins
20250202 120625 worker: Current view:      reset to Playback
20250202 120625 worker: Active flags:      at least one true
20250202 120625 worker: Reset flags:       all reset to false
20250202 120625 worker: MPD volume:        set to 0
20250202 120625 worker: Session check:     ok
20250202 120625 worker: --
20250202 120625 worker: -- Startup complete
20250202 120625 worker: --
20250202 120625 worker: Mount monitor:    started
20250202 120625 worker: Radio monitor:    off
20250202 120626 worker: Watchdog monitor: started
20250202 120626 worker: Responsiveness:   Default
20250202 120626 worker: Ready
20250202 120705 worker: Job spotifysvc


RE: Hardware Volume on RPi DigiAMP+ and DAC Pro - Tim Curtis - 02-02-2025

The audio configuration in the log looks ok. These AMP hats might be muted by default like the old IQaudIO units.

Try this command

Code:
sudo /var/www/util/sysutil.sh unmute-pi-digiampplus


RE: Hardware Volume on RPi DigiAMP+ and DAC Pro - tropappar - 02-02-2025

(Yesterday, 11:51 AM)Tim Curtis Wrote: These AMP hats might be muted by default like the old IQaudIO units.

Yes, you're right. The mute LED is on.


(Yesterday, 11:51 AM)Tim Curtis Wrote: Try this command

Code:
sudo /var/www/util/sysutil.sh unmute-pi-digiampplus

It returns
Code:
gpioset: error setting the GPIO line values: Device or resource busy


I also tried setting it RPi.GPIO library but it returns

Code:
lgpio.error: 'GPIO not allocated'

I found some info in IQaudIO's user guide (see attachment). But I'm not quite sure how to apply it.

RE: Hardware Volume on RPi DigiAMP+ and DAC Pro - Tim Curtis - 02-02-2025

According to the manufacturer its muted by default and GPIO22 controls the mute state, but it doesn't specify whether muted = 1 or 0. https://www.raspberrypi.com/documentation/accessories/audio.html

This command for moode9 series "sudo /var/www/util/sysutil.sh unmute-pi-digiampplus" sets GPIO22 high (1) as can be seen below.

Code:
# Unmute IQaudIO Pi-AMP+, Pi-DigiAMP+
if [[ $1 = "unmute-pi-ampplus" || $1 = "unmute-pi-digiampplus" ]]; then
    CHIP=$(gpiodetect | grep pinctrl | awk 'NR==1 {print}' | cut -d " " -f1)
    gpioset $CHIP 22=1
    exit
fi

If I run the individual command to detect the chip it returns "gpiochip0". This can then be used to set a specific GPIO high (1) or low (0).

Code:
pi@moode9:~ $ CHIP=$(gpiodetect | grep pinctrl | awk 'NR==1 {print}' | cut -d " " -f1)
pi@moode9:~ $ echo $CHIP
gpiochip0

sudo gpioset $CHIP 22=1

You could also try setting the Named I2S device to "IQaudIO Pi-DigiAMP+" and then the unmute code will automatically run during moode startup.

If none of the above works its not obvious to me what might be happening on your end.

RE: Hardware Volume on RPi DigiAMP+ and DAC Pro - tropappar - 02-02-2025

I also ran the commands you mention directly. I get the same error, regardless of setting it to high or low:

Code:
gpioset: error setting the GPIO line values: Device or resource busy


I also tried changing the audio device to IQaudIO but still no luck.

What I noticed: The mute LED is on but as I soon as I start playing something, it turns off (both for IQaudIO and RPi). But still, no audio output.

Quote:If none of the above works its not obvious to me what might be happening on your end.

Well, same for me Huh 

I did a fresh install through RPi's imager. I only changed network, user, and audio config as posted in the screenshot and enabled Spotify renderer.

RE: Hardware Volume on RPi DigiAMP+ and DAC Pro - Tim Curtis - 02-02-2025

Are you trying to play from Spotify or MPD?

RE: Hardware Volume on RPi DigiAMP+ and DAC Pro - tropappar - 02-02-2025

Tried both

RE: Hardware Volume on RPi DigiAMP+ and DAC Pro - tropappar - 02-02-2025

So, finally I got it to work!
What I did:
  1. First boot, select Named I2S device, restart
  2. Second boot, select Output device and Volume type, restart
I played around a bit and it seems, there is no audio output once I change the audio settings settings later on.