Monophonic moog for Casio Model Casiotone 701

I am looking for a monophonic Moog for my girl and was wondering, if there are elements or upgrades that I can use in connection to the Casiotone 701, which I already own.

Also are there packages where you can turn your iPad into a Moog at least sound wise?

I don’t want to have so many synths cramming my place so I thought this might be the way to go.

Thanks for your time and help, Alexander

I guess I’m not really sure what you’re saying… You want to upgrade your Casio to be a Moog?
I’m just going to assume you want to buy a monophonic Moog. Vintage: Rogue, MG-1, Prodigy, Micro, Source. Modern: Phatty, Minitaur, Voyager.
If you want Moog on your iPad, buy Animoog in the app store.

I want to upgrade my casio to be a moog. What do you need firmware or something?

I think Moog just released firmware update 1000000.001 for the Casiotone 701. It makes it sound like a polyphonic Voyager.