Cracking and popping

I’m getting a lot of crackling and popping. I only have 9 tracks, 3 are midi, the rest are audio. I don’t know what the issues is. Am I using too many effects? I cannot imagine I am over polyphony with those 3 tracks.

I have an iPad 2. I just picked up an Alesis ioDock so I can run guitar and keyboard audio in. I cleaned out my trash and the media box, closed all programs and rebooted. Not sure what else I can do to free up resources, but this is starting to frustrate me.

Any thoughts?

Make sure you are in airplane mode and close down all other apps.