thanks for your words about my songs!
first of all, answering to your question:
I’m actually a long-time tracker user: I’ve used trackers since 1994 on Commodore AMIGA.
I can say I have never used a piano-roll based software. Yes, I tried them, but the impression I got from using them is something like: “geez, this is a toy…”. I’ve always been accustomed to say “play this note NOW and with THIS volume, THIS panning, THIS accent…”… well, this is what trackers are for…
during first times (which could even last for months, or could just be days, depending on how you will “feel at home” with Renoise), you will probably think that trackers are for geek programmers, too slow and misterious but, once you will get deeply into the idea, you will probably be unable to use anything else because it will feel too bounding to use a piano roll.
I say: download the demo and try giving it a run for some days. Also, we have a good and extensive online tutorial and a kind forum community which will surely answer your beginner questions.
I cannot provide you MIDI files, since there is no easy way to export MID files from Renoise, but I can send you XRNS files (which is Renoise native file format) of a couple of my songs, provided that you own at least Kontakt or Sampletank (let me know which you prefere, but Kontakt would be better. If you also own Native Instruments Battery Studio Drums CD’s then we have almost the same setup), otherwise you won’t hear anything while playing them.
you can also give a listen to (and above all a look at) my song Breath, which has been made using no VST plugins and then can be simply opened into Renoise and played without any other requisite. Ok, it’s not jazz, but it can give you an idea of how drumming works into a tracker.
about the sound quality: I mostly use only Renoise built-in effects such as its reverb and width command.
I’m a drummer so I tend to emphatize the sound of drums, sometimes even too much…
I hope I have cleared your ideas a bit, and feel free to ask for more.