Just to illustrate my point (and this demo is a LONG way from being the worst we've had, mix-wise), take a listen to the volume of the solo part in the factory Intro...

Then listen to how much louder the RH sounds are he's playing.

It's a really nice demo, and shows off how nice the BK-5 is at only about $1000, but once again, the RH pops out a bit much.

If your arranger has a Keyboard/Accompaniment Balance knob or slider, and it has a simple MIDI recorder, try this... Setup your Recorder, and play a song with one of your usual Performances. Then play it back. Now start winding down the Keyboard Parts until you are struggling to hear them, THEN start slowly bringing them back until you hear them at a nice balance.

I bet you that fader is WELL down!