I just joined so I could chime in here. I know its a couple of years too late for the OP, but the nature of the internet is that people will land here for as long as the FP-30 and iOS devices are still in use, so hopefully useful to someone.
It really pisses me off on forums when people give generic 'helpful' advice, when often (a) they don't understand the OP's question. (b) they don't understand the technology they are giving advice about (c) they don't own or haven't used the gear they are giving advice about.
I only give advice about gear I own (i have a FP-30), or have owned previously and know well enough to give answers about.
So that aside, here's my 2c
1. Sorry Biggles, but your first sentence is wrong. While Bluetooth is a bitch for latency when using audio, we're talking about MIDI here, which is tiny amounts of data in comparison and works fine over Bluetooth. I doubt Roland would have included it as a feature if it simply didn't work.
2. Sounds like the OP needed to update the firmware in his FP-30. They updated the app and the piano needs new firmware to work properly. Luckily, it's a fairly easy task to do, you just need a USB memory stick. Here's a link in case anyone needs to do this:
The experience of playing a Roland FP-30 digital piano can be enhanced when connected to the Roland Piano Partner 2 app. Enjoy an easy to use interface on your very own tablet that allows you to se...
rolandus.zendesk.com
3. Here's another tip to give you a bit of future-proofing: one of the nice features about Apple and iOS apps is that they can just break when they are updated (go figure). Sometimes, you update your iPad to the latest iOS and you discover a bunch of your fave apps no longer work. Unless these apps are still actively developed, you may not be able to update them to a version that works with your iPad. Apple don't even let you downgrade to an earlier iOS version, so you are screwed. The solution for musicians is to either stop using iOS devices, or because i'm accepting the sad fact that they are WAYYY better than the Android alternatives, do the following: once you get your iPad working with the apps you need, freeze it in time. Stop updating iOS - ignore the nags from Apple to do so. Use it solely as a music tool and stop using it for email, online banking, etc. so you don't need to worry about vulnerabilities and security 'threats'. Use a separate device for your online activities
After a period of time has passed, and you start getting envious about some new apps which are awesome, you can buy a shiny new iPad (or it's latest equivalent), set it up the way you want again, and do the same. Meanwhile you have your trusty old iPad to rely on.
Nothing worse than discovering your setlist app no longer works 20 mins before a gig, just because you updated to the latest iOS to get some new features you didn't even need.
Also this has the added advantage of making sure your iOS device still runs like new. I have a range of iPad models with different iOS versions and the 2nd gen one works as fast as a new one - just with some older apps on it - some of which don't even work on a new iPad.
Unless Apple change their policy of not allowing downgrading to earlier OS, I think this is the best approach.
OK, i've gone off on a little tangent here, but at least I addressed the OPs specific issue