They hide arranger keyboards backstage, so Tek can watch the show too.
Actually, it's a bit more complicated with TV shows. Even though you can't see arranger boards, you can sure hear them. Couple of comedy shows in the 90's used Korg I3 arranger workstations. Sometimes there's just too much happening, so there's no time to invite bands and musicians, rehearse etc.
I also know a few studio pros, who among many other synths and instruments use high end arrangers.
-ED-
[This message has been edited by 3351 (edited 03-11-2004).]