Hi, edit es_systems.cfg:
nano /home/pi/.emulationstation/es_systems.cfg
Navigate to the Playstation section and change:
COMMAND=/home/pi/RetroPie/supplementary/runcommand/runcommand.sh 1
to 2, so it reads:
COMMAND=/home/pi/RetroPie/supplementary/runcommand/runcommand.sh 2
Hope this helps