#!/bin/bash

if [[ -z $1 ]]; then
    cdda2wav -q -e -d0 -N -B   dev=/dev/cdrom &
else
    cdda2wav -q -e -d0 -N -t$1 dev=/dev/cdrom &
fi

PID=$!

# this program skips a lot
sudo renice -5 ${PID}

wait ${PID}