Hi, I am experiencing similiar issues here as well. I record a jazz band during rehearsals and have small ‘holes’ in the audio. Seems to jump a tiny bit forward. It happens almost at every recording/track 1,2 or 3 times.
My setup is very simple. I use a Tascam iM2X stereo condenser mic plugged directly into the iPad.
I did not notice all of this when recording tracks with my Line 6 Mobile Keys 49 with the on board keyboard sounds of Cubasis. I also have an Alesis IO Dock but didn’t try so far with Cubasis. Garageband gives no problems there.
Hans