By the way, I was just watching a video last night from NAMM 2015 in which a Yamaha rep was showing the new PSR-E353. He had an iPad hooked up to it running (I think) Yamaha's Sound Controller app, which includes-- among other things-- a virtual pitch bend wheel and modulation wheel. He specifically stated that the app gave the PSR-E353 pitch-bending and modulation abilities, even though it doesn't have an actual pitch bend wheel or modulation wheel.
Incidentally, I recently had trouble finding the Sound Controller app, as well as Yamaha's Synth Book app, in Apple's App Store, apparently because they're flagged as being for the iPhone and hence don't show up in a search for iPad apps, even though they do work on the iPad. So if you're on an iPad and are searching for a particular Yamaha app in the App Store, if you have trouble finding it then you should go to Yamaha's web site in the browser and click on the link there, which should take you to the app in the store.