Just listened to your Katrina etude composition. I like the composition a lot!
Also nice idea to play the midi file back with a cursor showing where the machine is in the execution of the file. You should however make clearly that it is a midi file, if this the case (in order to not get confused with the real recordings on PianoSociety).
After long time practicing standard repertory (1975-1988), after 1988 I decided use mostly of my time to compose and perform my music - only.
However, I decide do one exception, to contribute to the site with some of my interpetation.
I think that is an uttermost noble gesture to devote endless time and energy (what is needed I expect) to practise a complete Rachmaninoff concerto to get an absolutely flawless result, with the solely aim for a posting on this site - if it would be a real recording.
To me it sounds not like a real recording, instead like a digital keyboard sound, coming from a midi file. It is a digital keyboard, right? Is it also midi based?