Wow Jeff this is thread is like a cosmic virtual trip through memory lane. The MC 500 is nothing more than a clumsy paper weight without a copy of the system disc. You'd have a better chance of using a jar of mayonnaise as a sequencer/composer without one. I learned early on to include copy the system disc with every box of 3.5 floppy discs I bought.
I believe I still have the Roland system files on a CD somewhere, however I no longer have a floppy drive for my computer.
It wasn't very longer after I enjoyed the very delightful experience and super easy setup of the MIDIMAN 8x8 digitally controlled MIDI patch bay. It was super easy to use because it could store very elaborate user defined MIDI routing scenes to it's own internal memory.
I still have that as well but don't use it often unless someone brings some vintage synths to the studio, I'll leave that big clunky 19" rack mount box in the closet. Also in the 19" box of rack stuff is an ancient TC Helicon Voiceworks Plus, Digitech GSP 5 guitar Processor, Digitech DSP 256 multi FX processor that are all patched into the 8x8. Also non MIDI gear such as 2 DBX 166 compressor limiters, DBX Type 2 Noise Reduction, and 2 channel Aphex Aural Exciter Type C2. Always loved that psycho acoustic processing for sound restoration, and Aphex's BIG BOTTOM can put the THUMP back into thump!
I don't know why I keep this rack together, other than it just served me well for decades now I can't bear to part with it
Though I do still use an tiny under the table out of sight little MIDIMAN 2X2 to keep my vintage Kawai-11 61 key digital synth and Roland Super JV-1080 synth module on deck at all times.
For those that don't know, MIDIMAN was bought up by M-Audio, and they still manufacture these same exact ROCK SOLID bullet proof USB MIDI interfaces today. Only difference is a bit if superficial graphics designs and they are rebranded M-Audio.
I've always had a great appreciation for the Atari systems, kind of jealous in a way being stuck in the Commodore 64 camp being I owned an Allen & Heath large format mixing desk that only supported the Commodore 64 for mix automation recording on a Tascam 16 track tape machine. Grr.
Curious how a $10,000 mixer only offered support for a $100 computer.

But truth be told $10k was actually dirt cheap for a new large format desk, a tiny fraction of the cost compared to it's nemesis built by Solid State Logic for around $100,000 and not really that far behind. Just like SSL's where a fraction of the cost of Focusrite Redd consoles for around $1,000,000, weren't that far behind.
Of course A&H and SSL desks were built in factory assembly plants, greatly reducing the price of having Rupert Neve and his band of audio engineering fanatical brainiac's come visit and custom build your mixing desk on site by hand.
However I was getting pretty close to digital recording sound quality with the A&H/Tascam setup with a bit of help with DBX Type 2 noise reduction, they really bumped up the signal to noise ratio and dropped the noise floor to dead silence by removing all traces of hiss.
I also tried and really like E-magic Logic on the PC. I was
very close to purchasing a licensed version when Apple bought or E-Magic and orphaned the Windows version.
A good friend, roommate, and bandmate of mine went to the music store on a quest for Cakewalk upon my recommendation, but came home Logic because the salesman at the music store convinced him it was better.

So I said, "Ah huh, ummm, maybe, I have no idea so you are on your own with the exception of any help you may get from your salesman. And feel free to let me know how that works out for you, and exactly how much better it is."
So after about a month of listening to him whining about the elevator muzac coming out of the telephone while he sat on hold and witnessing his "Hissy Fits" caused by Logic's learning curve, I started to get bored and I guess as a result, I failed to see the irony and humor in the current situation.
So I dove in to see what the fuss was all about. After the first night of clumsily figuring out how to navigate around and inside of Logic, we started our first project the very next evening.
By the time the project was finished I still didn't know if Logic was better, but I indeed grew fond enough for it to go to the music store and inquire about purchasing it with my buddy in tow who pretty much guaranteed he could get me a much better deal if he introduces me to the salesman who sold him Logic.
As it turned out, the salesman who sold my buddy Logic no longer worked there. But while trying to talk to another salesman who kept getting interrupted by putting people on hold with a near constant stream of telephone calls,
AND PROCEEDED TO IGNORE THEM, officially proclaimed and announced that they had no copies of Logic in stock at the moment...
Than his eyes lit up when the GRAND EPHONY struck him a-a-a-and he smiled his broadest smile a-a-a-a-and w-w-w-waved a w-w-w-w-wiggly finger in the air and excitedly asked if he could interest me in the
much better DAW from Cakewalk?
And as my buddy and I locked eyes, in about the time span of about 20-40 ms latency---- I saw something that could only be described as the perfect morphing of fear, disgust, and confusion run across his mugshot.
And so I narrowed my eyes at him and feigned righteous indignation and shouted; "CAKEWALK? CAAAAAKEWAAAAAAAAAALK?? SIR! CAN'T YOU SEE THAT I AM LACTOSE INTOLARENT FOR CRIPE'S SAKE??? I DON'T EVEN PREFER THE TASTE OF MACINTASH APPLES, LET ALONG THE TASTE OF COMPUTER PARPHIRALS! WHAT IN THE NAME OF ZEUS'S BUTTHOLE IS WRONG WITH YOU, KIND SIR? WHERE IS YOUR INTESTINAL FORTITUDE??"

Well talk about LMAO to the power of 12! We both could barely see our way to walk out of the music store to the car with our eyes tearing up so bad and our lungs gasping for air, and stomachs aching and cramping up of belly laughter.

I too really loathed SONAR X1, and what compounded my anger and frustration was not only the Skylight GUI, I have no words to describe how I felt about the makeover and rearranging of keyboard shortcuts.
I felt completely like a stranger in a strange world, and felt that's it for Cakewalk, by the time SONAR 8.5 is no longer supported by Windows.
But when X2 came out and the baker's reverted back to the old keystrokes burned into my brain, I decided to continue on with the upgrades.
However I continued on with using 8.5 as my primary DAW version, and just practiced with X2 to become familiarized with it.
It wasn't until X3 was out for a couple of months before trusting it enough to abandon 8.5.
Well almost, I still have 8.5 running on an old Windows XP RAIN laptop with a Presonus 8 channel audiobox and it's fairly snappy and great machine for it's age.
Only thing I upgraded on it was cloning a newer 1 gb Western Digital Caviar Black 7200 rpm hard drive to it.
And I also installed an early version of Studio One, which is surprisingly good for a free bundled DAW.
I still prefer SONAR though.