I remember the ARP's pads...one of the worst systems I've ever used...more of novelty than anything else(and of course, ARP wanted to be "different")

I had one here for several months until it was sold to a collector.

I also had the earlier one with the knob...not a lot better.

I can deal much better with the wheels, although Roland's bender is pretty good as well.

I remember when Yamaha made the PSR-4500/4600 with the "wheels" under, and in front of, the keys....we called them "roll bars".

They were actually pretty good, but Yamaha soon reverted to the more familiar conventional wheels.