>>528148oh sweet yeah you've got it made then. I'm sure there are other multi track recorder apps but FourTrack is totally worth the price and I know for a fact it has monitoring so you can use it for exactly what you want if you follow the steps in my other post. it's this one here.
https://itunes.apple.com/us/app/fourtrack/id294768646?mt=8I've made some real decent sounding recordings with guitar, vox and drums just by using the iPhone mic as a room mic and the monitor feature is basically how I taught myself to sing by being able to hear myself in the headphones. once you record four tracks you can bounce them onto track one and then have three more tracks, bounce those onto track two and etc. just like a real four track tape machine. highly recommend this app to anyone.