volume manipulation of pipewire split front and back

vol

#!/bin/bash
card_name='Generic [HD-Audio Generic], device 0: ALC1220 Analog [ALC1220 Analog]' ##### PLEASE EDIT THIS 
card_name=$(sed -e 's/\[/\\\[/g' -e 's/\]/\\\]/g' <<< "$card_name")

[[ -z "$1" || -n "$2" ]] && {
  echo usage: $(basename $0) '[:num]?(%)(-+)'
  echo same number / percentage accepted by 'amixer set'
  echo ie vol 5%+
  echo ie vol 5
  exit 1
}
vol=$1



output=$(pactl info | grep Default\ Sink | cut -f2- -d: | awk '{print $1}')
card=$(aplay -ql | grep "$card_name" | perl -lne 'print $1 if /([0-9])/')

if [ "$output" == 'headphones' ]; then
  amixer -c $card set Surround $vol
else
  amixer -c $card set Front $vol
  amixer -c $card set LFE $vol
fi