You might try the Marantz remote app on your IPad. Oops, should have read your post a little better.
That app is a joke and a half. it's not even a properly functioning remote control as 1/2 the functions of the real remote are not even available on it. Compared to the Pioneer remote, there is something that actually works.
What I don't understand is that Denon is owned by the same company and it's ipad remote app has more functionality but I guess they decided to simply SHAFT the Marantz purchasers.