Reply to Windows, Mac and IOS Compability Please HELP !

Hello everyone, i recently bought some new gadgets to make a small bedroom studio and i need some help, I just bought an HP computer, and a microkorg midi synthesyser, to produce using Ableton , and reason, but i also have a macbook and i intend on buying an Ipad to use it with certain apps for production. I wanted to know if it is possible to have my synth connected to my Windows computer and also have the Ipad conected to the computer to use it as an istrument or does it only work if its conected to another computer/laptop from mac ?

This is what i want to do


.................................................. .......................
....................(ableton & Reason).............................
(Speaker) - (Windows computer) - ( Speaker )...........
.................../.......................\....................
............(Microkorg)..............(IPad)....... ................
.................................................. ......................

Is this possible ? or does the computer have to be a mac to have the ipad pluged in as an instrument ? Do i also need to buy an audio card to have everything pluged in? or can i plug in everything directly to the computer ?
Also im believeing on buying a moog slim phatty to have more controll on the sound i make and a midi fighter from ranking s should i get this or is it too much ? .. I produce Deep House, Tech House, and Electro indie ( sort of like chrome, daft punk etc..)

Please Share with me some thoughts and sugestions..

very much appreciated