So the Iphone is only a storage device and has no part in the analogue chain, if so then it will have zero effect on sound, agreed.
Had a quick look at the history of Cubase, I remember it starting on the Atari ST, but I thought it went to PC then, but it was Apple after ST, then PC too.
Didn't know that!
Motu makes some great interfaces, Maudio ... I steered clear, well clear!
Last interface was EchoAudio.
The PT HD systems was the ones with rack of hardware required.
PT lite was native, but didn't even compensate processor cycles for effect plug-ins, so it introduced massive phase distortion and you had to manually adjust to correct phase!
Again, I have no idea what they have now!
On apple now I think pro tools and logic audio are the weapons of choice.
Sibelious was more a notation bridge I thought, and I also think it has died.
Melodyne is a software plug-in, an audio effect, one of millions out there now, but they do tend be tools that can define a sound, like different synthesisers (which also come in a plug in).
If cubase doesn't have the reverb, guitar amp modelled sound, Hammond organ sound, just use a software "plug-in".
I mentioned that particularly(Melodyne DNA) as everyone was raving about the technology when it was being released (I stopped doing music around this time).
IMVHO it is a bloody awful thing that has been unleashed upon the world, it is the same as autotune, but it can "look" at a polyphonic sound (eg a guitar chord), separate a single element and allow editing of that note alone.
So, you can change a minor chord to a major after it has been recorded. That is an audio stream, not midi data!
Helps the talentless hide their lack of ability, and also allows record companies to keep pumping out the same shit with another pretty face, year in year out.
We might be meandering off topic here a little