IgorO

I tested one more time and it works without nothing plugged in. On mixer I need to maximize gain and volume of channel increase, volume knob on piano to set 50% and it sound excellent. Thank you all for replies and help!

Ok thank you! So without dummy plug in headphones input, line outs are not working..

Is it correctly to have dummy plug in headphones input to get sound throw line out and volume knob set on maximum or hearing sound of pressing keys?

I tried to connect to a mixer and it sounds excellent with dummy plug in headphones input(speakers are muted) and throw line out. Next, I tried to connect throw headphones input, it sounds also good but not so strong like throw line out. Also when I play, I can hear sound of pressing keys a little bit..I don't know if it's normal or not.. I don't know if it pays off to contact my seller and return keyboard and ask to get correct keyboard?

@Mojo of the G Thank you! Yes, when I plug in headphones into one of the jacks then internal speakers are muted. I'm using audio interface for testing line out and it sounds good but I will try to connect on mixer to see how it goes. But after I unplugged headphones then the internal speakers are unmuted and line out is working as well. I tried that yesterday for the first time..

Hello, I'm having the same issues with LINE out on S3000. I tried to plug in headphone jack and then LINE out started to work, also I tried to unplug headphone jacks and LINE out are still working but with built in speakers on. Why is this happening? How to fix that?