I'm not sure if its legit for me to ask this here but...

Looking for some kind of adapter to get better audio quality from the ipad to an amplifier. When you using the ipad with the MODX, it sends the audio through the usb cable and then out of the analog outputs of the keyboard. Doing it that way, it sounds great, but when using a midi controller and using the headphone jack of the ipad, it sounds a lot worse. It sounds fine a lower volumes but distorts pretty badly at higher volumes when playing piano patches. I'm looking for some kind of solution such as an Irig or something like it. what is everyone else using?