I tried to use the REW generator to stimulate a hifiberry board and had the problem to send the produced sound to the hifiberry. Copying files was quickly boring.
This might help win/osx users:
On a Debian 11 system (pulseaudio 14) I was able to do:
sudo apt install pulseaudio-module-raop
pacmd load-module module-raop-discover
flags: NETWORK HW_MUTE_CTRL HW_VOLUME_CTRL LATENCY
suspend cause: (none)
volume: front-left: 65536 / 100%, front-right: 65536 / 100%
base volume: 65536 / 100%
volume steps: 65537
current latency: 0.00 ms
max request: 1 KiB
max rewind: 0 KiB
monitor source: 16
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
used by: 0
linked by: 1
fixed latency: 250.00 ms
card: 8 <raop_client._192.168.168.226__5000>
device.string = "[192.168.168.226]:5000"
device.intended_roles = "music"
device.description = "HiFiBerry"
device.model = "ShairportSync"
device.icon_name = "audio-card"
network-output: [192.168.168.226]:5000 (priority 0, latency offset 0 usec, available: unknown)
With some wild clicking in pavucontrol and REW I was able to hear the generated tone!
In REW I had to select the Output device "default [default]" and not the "Default device" for reason unknown.