In an idle moment (yes I actually had one - maybe I should frame it) I stuffed a short oldish track of mine through jammin. I left all the default setting apart from lifting the input gain as I knew the level was low.
I was quite astonished at the difference it made, so quickly got the source files and ran it again going directly from Rosegarden -> jammin -> Audacity the result is here. It is called March Of The Trolls and the original idea came to me long before a certain film gave trolls a bad press
<ahem> I recommend playing loud
<ahem2> If you have a sub-woofer all the better - especially at the end