Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.Download on the App Store
Audiobus is the app that makes the rest of your setup better.
I did a latency test of a lot of small portable speakers - JBL, Sony, Ue, Phillips etc... :)
Connected a 3,5mm jack from a Macbook Air to the speakers and put them next to the internal mic and recorded a ping through them to Logic pro X......I put the fastest ones in the top and the most laggy ones on the bottom..
The last two digits in the timeline are ms - so looking at the chart you can see how much latency the different speakers had on my system.
For me the best speaker was Marshall Stockwell which performed better than the internal MacbookSpeaker. The rest were pretty late....
All the best