Hi Giel, you might like to consider joining the iPad musician Facebook group. We have around 1250 fairly active members - several who are buzzing about your app right now, and quite a few dev's seem to get involved as well.
https://www.facebook.com/groups/Ipadmusician/
Invite
Re: Invite
Thanks for the heads up.
Giel Bremmers
Giel Bremmers