Hey there

I'm not sure how well the iPad & iPhone will allow you to use two apps like that at once.

If it did work at all, you would be playing videos and the amp at the same time with both apps using the sound on your iPad. I don't think this would work. My recommendation is to purchase a small portable amp you can take along with you on your travels. Though if anyone reading this has used an amp app & played videos at the same time without any sound issues please let us know.

If you want to play on your iPad this Apogee JAM Guitar Input seems to have really good reviews:

http://goo.gl/Rcor6w

Here is a good portable amp if you're looking for something small with good quality & simple to use:

http://goo.gl/tJIyj4

All the specs are listed on each page.