Few years ago we had a Scratchpad and we had mobile version of Z3TA.
I think i't s to time to get them back on market.
Also I want something simple to control Cakewalk with iPad. I can use TouchOSC, but it's hard for me to set it up. I would like to use its features to control Step Sequencer, drum pads, etc) Presonus has Studio One Remote. Ableton Live has few controllers.