Beats, welcome to MY FUCKING NIGHTMARE over the last few days.
The lack of comprehensive info out there for MIDI support from apps to hardware/apps to DAW is nothing short of total SHIT
I've been piecemealing stuff together, but it's been a challenge.
A few things I've learned (I think)
Camera Connection Kit - For connecting only to a piece of hardware (synth or controller)
The camera connection kit, on it's own, is only for connecting a piece of hardware directly to the iPad via the USB cable that comes with the hardware. Lots of YouTube videos on this MIDI connection type.
Camera Connection Kit with A USB-to-MIDI adaptor - for connecting to hardware or soundcard/DAW
I've not seen any examples of this, but I've certainly run into people on forums who are using this method. For instance, the Connection kit with the M-Audio MIDI Uno:
Line 6 MIDI Mobilizer - for connecting to hardware or soundcard/DAW
So far this seems to be the most popular method, but only because you could do it prior to iOS4.2. At $70, this method is about the same amount of money as buying a camera connection kit and USB-to-MIDI adaptor. Many people seem to think that the Line 6 MIDI Mobilizer is more robust, reliable, and elegant. *shrug* The reviews have been nothing short of glowing, so....
Now that CoreMIDI is here, apparently the MIDI Mobilizer will work with any MIDI hub for a connection to your DAW (though I cannot positively confirm this). But what about the hardware? Do companies still have to be licensed? Do the app developers need to be licensed? Not sure, but I suspect so. Lost yet? Me too.
I can tell you this, if the Line6 isn't going to be as versatile, providing a true open MIDI connection like the cam conn kit/USB-To-MIDI cable combo, that fucker is going back to the store.
MIDI over WIFI using the Mac's MIDI Networking - for connecting to your computer/DAW
An exciting option to be sure. So far the only app I've seen that officially has this feature is Molten, and I'm going to try it out shortly. Obviously this is the same deal as touchAble or Griid: You'll need to do this via an ad-hoc network or wireless router network.
MIDI over WIFI using 3rd party MIDI Networking - for connecting to your computer/DAW
Free wifi MIDI apps like DSMI are another option. Pianst Pro works with DSMI, but damned if I can get it to properly record notes in Live.
THE APPS AND MIDI TYPE
What Apps Use What?
Here is where things start to completely fall apart and get wonky. All apps that now have MIDI support will state as such on their websites or in the iTunes descriptions. What they DON'T fucking tell you is whether or not any other options are supported. For instance, the NLogSynth app says it will work with either the Camera Connection Kit, or the Line6 MIDI Mobilizer. Okay, cool. More is fucking BETTER. But will the app be able to work with a connection kit and USB-To-MIDI adaptor and then be able to be connected to your DAW? Who the fuck knows. WRETCHED.
The amazing iMS-20 Korg app now supports MIDI. It says it uses the Camera Connection Kit for connection to external devices. Uh, yeah. What about the MIDI Mobilizer? Some folks have reported that it doesn't work. What about the cam connection kit and the USB-to-MIDI adaptor? The Korg manual should have more fucking info on this, but....nothing. Fail. Note: My Line6 just arrived and I'm going to test it out later.
UPDATE: Korg just announced that only MIDI IN is being supported. omfg. FUCK YOU, KORG.
It's In The Hands of The APP Developers
The NLog Synth folks have the answer: The more MIDI connection options, the better. If there's not options, pretty soon it'll be like Android World - where every fucking app dev is doing something different and - even though it's MIDI - you may have to keep buying new connection kits to meet whatever the dev comes up with.
MOTHERFUCKING CLOCK SYNC
The ONE feature that raises these apps to a true performance tool, and nobody seems to care.
Honestly this is the most overlooked bit so far on all sides. It's fucking pathetic. The only app/developer that has said shit about clock sync is the Molten folks.
Congratulations to all app developers out there for completely fucking up the entire realm of MIDI implementation for iOS4.2 You fucking douchebag mongs. Apple has given you, By The Grace of God and Steve Jobs, a beautiful device and fantastic OS update. But you have squandered their Good Graces and given us an unadulterated fucking MESS. You rat fucking bastards. (except the Molten and NLog folks. They, at least, have gotten it partially right.)
We want, without delay:
1. MIDI via cam connection kit
2. MIDI via the Line6 MIDI Mobilizer
3. MIDI via wifi through onboard Apple MIDI networking or PC MIDI networking.
4. Full MIDI implementation including clock sync.