autobalancing sound level with pactl

auto_audio_level.sh

#!/bin/bash
CNT=0
CNT2=0
while :; do
    LVL=$(arecord -f S16_LE -qd 1 /tmp/rec.waw && sox /tmp/rec.waw -n stat 2>&1 | awk 'BEGIN{FS=":"} NR==4 {print $2}')
  
    CLVL=$(pactl get-sink-volume @DEFAULT_SINK@ | awk '{ print $5 }' | egrep -o [0-9]+)
    
    echo $CLVL", "$LVL", "$CNT

    if (( $(echo "$LVL>0.13" | bc -l) )); then
        pactl set-sink-volume @DEFAULT_SINK@ -10%
        CNT=20
    fi
    if (( $(echo "$LVL<0.08" | bc -l) )); then
        if (( $(echo "$CNT>0" | bc -l) )); then
          CNT=$(( $CNT - 1 ))
        else
            if (( $(echo "$CLVL<100" | bc -l) )); then
                pactl set-sink-volume @DEFAULT_SINK@ +10%
            fi
        fi
    else
        CNT=20
    fi
done