Well, Doug, I guess it comes down to (a) the difference between 'practice' and 'arranging', and (b) how much practice I need until I'm comfortable with a song.
When I'm 'arranging' I'll often play a measure over and over again, trying different instruments, different Technichord settings, different DSP settings, and so on. I wouldn't inflict that on anyone unless I was trying to sell them on the versatility of the KN7000!
'Practicing' is certainly more pleasant listening, but my concern here is that I may play some of the same songs every night for two or three weeks. If I'm going to play before an audience, eg at our local keyboard club, I always spend some time practicing without headphones as the sound from the on-board speakers is not the same as thru my headphones.
Yes, headphones do stop some sound getting in as well as out, but Elisabeth (my wife) has got used to that. If she wants to say something she comes over to the keyboard and waits patiently. Sometimes she answers the phone and I never heard it ring!
Bebop - Sound-proof room? Now that would be nice.
Mike