Delayed sound / latency with Yamaha Keyboard CubaseElements8

Hi There,

I have a latency problem with my keyboard. I already tried adjusting the buffer size, it doesnt work.
The sound form my own keyboard is realtime, but the sound coming out of mij speakers is like half a second later.
my input layency is 6.034 en output latency is 9.025
whatever buffersize I chose, the delay is still there.
what can be the problem of this? It;s been months now and i would really like to record something :frowning:
I hope that somebody knows what to do :question:
Thanx in advance,

Using Steinberg Cubase elements 8
Keyboard: Yamaha PSR-510
Steinberg usb audio interface CI1
Windows 8.1 enterprise 64 bits
Intel® Core™ i5-6500 CPU @ 3.20GHz (4 CPUs), ~3,2GHz
Memory: 16384MB RAM
2464MB used, 16232MB available

Activate the constrain delay compensation button. This will deactivating all latency causing plugins in your Project.