+1 John (jFord). And when you've heard some of those occasional noises there's NO DOUBT it's a real person because in some cases you can hear breathing, tapping, maybe a getting into it grunt, string noise....

A few times over the years I've thought what the heck was that noise and then solo'd to hear - it's kind of cool when you hit one that has that little extra ump that slipped into the recording...

I love Realtracks. If someone is convinced they're hearing midi, I wouldn't take that person too seriously.