Hi Bernamato,
I've connected an external monitor to my PSR 970 and it really does help. (I got an old monitor from a second hand shop)
After connecting I went to FUNCTION then UTILITY then CONFIG 2 then switched the setting to LCD
There's a you tube video on this (First 6 minutes)
https://www.youtube.com/watch?v=nFt5jhaPud4&t=382sIt's from a guy called Woody who has done some great PSR970 videos
He does though say that some monitors don't work so well and I found this when I tried one I had in the house
Good luck though and hope this helps
Kelvin
Hope this helps
Kelvin