Pianoteq + rotate screen + music sheets

piano.sh

#!/usr/bin/env nix-shell
#! nix-shell -p xorg.xrandr -p chromium -p pianoteq.stage-6 -i bash
input="Elan Touchpad"

function restore {
  xrandr -o normal
  xinput set-prop "$input" --type=float "Coordinate Transformation Matrix" 1 0 0  0 1 0  0 0 1
  kill $!
}

trap restore EXIT

xrandr -o right
xinput set-prop "$input" --type=float "Coordinate Transformation Matrix" 0 1 0  -1 0 1  0 0 1
cpupower frequency-set -g performance

chromium --new-window file:///home/mauricio/partituras/
Pianoteq\ 6\ STAGE &
read -n1 -s