There's a lot more happening with TouchDAW than stop start record. This is a viable controller.
You can wave it about to produce sounds assuming your phone supports it (just don't drop it in the toilet), play piano, and adjust faders on it.
 
Remote control plugins, sends, whatever...
Jean Michel Jarre's got one for his one man pub tour I'm told (j/k). 
 
Usual blurb video:
 
http://www.humatic.de/htools/touchdaw/
 
Sonar user setup:
 
http://youtu.be/KcCoa7JLddI
 

 
 
 

And iPhone/iPad users, check out the all new singing and dancing iRing, coming soon:
http://www.theregister.co.uk/2014/01/08/ik_mulitimedia_iring_gets_hand_in_first_for_ios_motion_control/
 
 

Sanderxpander
There's a variety of options for those unlucky enough to own Apple iCrap stuff as well.

Harsh no ?

I consider myself lucky. So what happened to you then ?

I use my iPad with V-Control, with its V-Window you can even control the multi-dock and VST's. Whats so iCrap about that ?

Each to his own........ I guess.

Hey Alex, i personnaly find rtpMidi a pain in the proverbial to set up. It seems to work ok with AC7, but the latency ......... I must look at touch DAW.

Cheers,
Jerry

I have an iPad with V-Control too and I like it. I just have a love/hate relationship with Apple. It was meant to be tongue in cheek anyway.

my new ipad air's the first ithing i've actually enjoyed :-) i'm using touchosc with ableton live, considering getting rid of my apc40...

Sanderxpander
I have an iPad with V-Control too and I like it. I just have a love/hate relationship with Apple. It was meant to be tongue in cheek anyway.

However i do agree with you about the bloatware called iTunes !!!!

Cheers,
Jerry

lawp
my new ipad air's the first ithing i've actually enjoyed :-) i'm using touchosc with ableton live, considering getting rid of my apc40...

I don't know if Lemur is still on sale but they have an awesome template called LiveControl 2.0 that they made themselves. It's incredible.
And on top, someone made a copy of the "Push" hardware that's available as a template called "Shove".

i'm using the LiveControl v1 template in touchosc at the mo, working well, if a little convoluted to set up :)