the bass, let me see if i understand this correct, you turned a wave file into midi data and its actually a plug in thats playing the bass, i didnt know that was possible
To be clear, your bassperformance is 100 procent intact and there. The MS20 is a monophonic synthesizer with a decent lowpass filter. If you put that filter way down you end up with a sound almost like a pure sine. So zero harmonic content. If you watch it on a spectrum analyzer you see only one curve for each played note.
I mixed in that part and rolled of the lowend of your bassperformance.
This way you have a very deep version that on it’s own doesn’t sound good but mixed with the bassguitar adding up to a rich sound.
You can do this with each synth offcourse, with Prologue use a one oscilator sine wave and filter it steep down.
Problem with Prologue is that the notes will become not consistent, like the C will be much louder then the D for instance, you need to work a lot with automation and multibandcompressor to even that out, plus it doesn’t sound as thick as the MS20.
If you don’t have melodyne you need to manually play the basspart, as I always did (before I had Melodyne 
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Greetz Dylan.
) the thing i picked up on most was the drums, as was pointed out the crashes weren’t there, its a common problem i have, the crash and ride never have that ring, i’ve saw myself picking a drum preset that i dont like as much because the cymbals have the tiniest bit more sparkle, having an output for each drum/cymbal i think is the way to go, from there i might figure out what makes the cymbals stand out.