LFO assignments via MIDI
I'm a relative noob to complex MIDI setups. I make music exclusively on the iPhone mostly using AB and/or AUM to connect various apps. I usually use a combination of Xynthesizer, DotMelody, and Aleph Looper to sequence synths. A few things I've found frustrating about creating music on the iPhone are:
Inability to start/stop apps with their own play button with AB's/AUM's play/record button. I feel like I must be missing something pretty obvious here, but it seems like it should be a simple matter to start all of these apps at once. Right now I am basically working around this (in AUM) by hitting record, starting them all as quickly as possible by double-tapping the home button to switch apps, and just fading into tracks if it sounds crappy. I know Audiobus Remote would make this less painful, but I use Audiobus less these days and only have one iOS device anyway.
Inability to record and edit automation data. I've been thinking that the best way to get around this would be to plan out each song better, and use LFOs instead of knob-twiddling to get the movement I want. My question is: Is there a way to do this through MIDI for apps without a lot of good built-in LFOs? Could I send LFO data from an app like Mitosynth to, say, the shape knob in Viking? I guess another alternative could be to play with velocity values in whichever MIDI sequencer I'm using, but not all apps will allow me to assign velocity to any knob. Are there set standards in MIDI that most apps adhere to? Should I stop looking for an app to do this and read a book about general MIDI?
Thanks in advance for any advice.