Originally Posted by Freebase Dali

Sorta makes your computer keyboard the "strings on the instrument" if you want to look at it that way, but in either context, the keyboard doesn't encompass the whole computer and all you're utilizing is keystroke functionality binded to MIDI notes that are sending input impulses to your synth, which is in turn generating the sound.
But you're basically correct... because everything that makes up a computer is still in effect and necessary for the operation of the virtual instrument.... except for your massive library of pr0n.