KORG KAOSS PAD 2
|Touchpad Effects unit - Released in 2002|
Inside the thing is essentially a multi effetcs processor with all your modulation, distortion, filtering and delay etc. effects. But the instant way of controlling the effects was a fresh idea.
I had the improved Kaoss Pad 2 version which also had some synthesizer sound presets. I used it as a synth on the album Enlightenment and as an effects processor on the album Opposites.
Later Korg has released a bunch of products with the same touchpad concept. There are mini versions and then some more professional products also, and Korg took the touchpad synthesizer idea further with the Kaossilator products.