Hi Janui,
thank you veryy much for your reply.
Inside the display driver i found what i thought i need:
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt 800 480 60 6 0 0 0
dtoverlay=ads7846,cs=1,penirq=25,penirq_pull=2,speed=50000,keep_vref_on=0,swapxy=0,pmax=255,xohms=150,xmin=200,xmax=3900,ymin=200,ymax=3900
after editing the config.txt nothing works anymore.
Don't know what to do anymore and I'm afraid I have to choose another player....
Yours,
Paddy