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[syndromeofadown]

I do not have a Pi 4 or 5 with me at the moment, so I have not tried the AA with these.
I messed around with the Pi3B a bit, using Raspberry Pi OS. I got music to play, but I can't get the power button to shut down the Pi.

There are 3 overlays used. They are all included in Raspberry Pi OS, so none are needed from the AA (so I assume). The old ones in the AA are different sizes.
gpio-ir.dtbo
hifiberry-dac.dtbo
mcp23017.dtbo

Config from AA

initramfs volumio.initrd
gpu_mem=16
max_usb_current=1
# dtparam=audio=on
audio_pwm_mode=2
dtparam=i2c_arm=on
#disable_splash=1
hdmi_force_hotplug=1
# add overlay for mcp23017 GPIO expander
dtoverlay=mcp23017,gpiopin=27,addr=0x25
#20180606-Emre Ozkan-added overlay for applechip
dtoverlay=i2c-rtc,pcf2127
##20180621-Emre Ozkan powerled and activity led turned off
dtparam=act_led_trigger=none
dtparam=act_led_activelow=off
dtparam=pwr_led_trigger=none
dtparam=pwr_led_activelow=off
#### Volumio i2s setting below: do not alter ####
dtoverlay=hifiberry-dac
dtoverlay=gpio-ir,gpio_pin=9,gpio_pull=up

Config from Raspberry Pi OS

# For more options and information see
# http://rptl.io/configtxt
# Some settings may impact device functionality. See link above for details

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

# Additional overlays and parameters are documented
# /boot/firmware/overlays/README

# Automatically load overlays for detected cameras
camera_auto_detect=1

# Automatically load overlays for detected DSI displays
display_auto_detect=1

# Automatically load initramfs files, if found
auto_initramfs=1

# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2

# Don't have the firmware create an initial video= setting in cmdline.txt.
# Use the kernel's default instead.
disable_fw_kms_setup=1

# Run in 64-bit mode
arm_64bit=1

# Disable compensation for displays with overscan
disable_overscan=1

# Run as fast as firmware / board allows
arm_boost=1

[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1

[cm5]
dtoverlay=dwc2,dr_mode=host

[all]

My hacked together config. Sound works, power button does not affect Pi.

# For more options and information see
# http://rptl.io/configtxt
# Some settings may impact device functionality. See link above for details

# Uncomment some or all of these to enable the optional hardware interfaces

###### EDIT 1 , Nathan uncommented the below line ######
dtparam=i2c_arm=on

#dtparam=i2s=on
#dtparam=spi=on

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

# Additional overlays and parameters are documented
# /boot/firmware/overlays/README

# Automatically load overlays for detected cameras
camera_auto_detect=1

# Automatically load overlays for detected DSI displays
display_auto_detect=1

# Automatically load initramfs files, if found
auto_initramfs=1

# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2

# Don't have the firmware create an initial video= setting in cmdline.txt.
# Use the kernel's default instead.
disable_fw_kms_setup=1

# Run in 64-bit mode
arm_64bit=1

# Disable compensation for displays with overscan
disable_overscan=1

# Run as fast as firmware / board allows
arm_boost=1

[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1

[cm5]
dtoverlay=dwc2,dr_mode=host

[all]

###### EDIT 2 , Nathan pasted everything below from AA config.txt, then added notes ######

dtoverlay=mcp23017,gpiopin=27,addr=0x25

dtoverlay=i2c-rtc,pcf2127

dtparam=act_led_trigger=none
dtparam=act_led_activelow=off
dtparam=pwr_led_trigger=none
dtparam=pwr_led_activelow=off

dtoverlay=hifiberry-dac

dtoverlay=gpio-ir,gpio_pin=9,gpio_pull=up

If I end up going the Pi 5 route then it has its own power button, so who cares about the AA power button not working.

I will ask on HifiBerry forums if anyone has some ideas to get Pi3 working with power button. Axiom forums did not provide a response.