Magnificent Emulation
With real programmability like the original (now nearly 40-years old), you should have little difficulty transitioning to the iPhone version. Fish out the original manual if youre rusty (it isnt supplied), and yes, you can upgrade in-app for the emulated plug-in packs (nothing to download, as they are already built-in, awaiting payment).
Aardvark1917 about
i41CX, v7.3.4