Thank you for your replies!

I have selected the BASS part to sub out2 and it's connected to an active subwoofer. And this is working fine, the only problem is that the expression pedal changes volume only for all the other parts but not BASS on the sub out. Sub outs are in MONO x 2 mode, and expression pedal function is TOTAL EXPRESSION. I have also enabled the EXPRESSION PEDAL setting on the SEPARATE OUT SETTING display.

Maybe I should initialize the keyboard to factory presets and then try again ?

Regards,
Pasi Kujanpää