I just got this app and am trying to get started recording. I have a Roland V-Drum kit that has a direct out that would normally run to a studio mixer/recorder. I ran a 1/8 cable with a 1/4 adapter from the Roland to the headphone jack on the ipad and got nothing.....I am ONLY hearing whatever the ipad's mic is recording. Can I run a direct out into the headphone jack of my ipad? Or am I just doing something totally wrong???? Can we not run intrument into the headset jack??