Renig,
The Korg PA1X has a pretty punchy sound to begin with but, I still find that EQ and compression are necessary to maximize the sound I'm looking for. Adobe Audition has
some excellent compression and limiting presets. Under Amplitude effects there is one imparticular I like. It is called "Hard Limiting". I needed to back off some of the threshold setting a little but, this preset puts your track 'Right In Your Face". Great for radio spots and jingles where impact is necessary. Might be a bit much for all song production but, I've had success with tweaking the preset slightly for some song production. I just saw an article in "Mix" magazine showing a diagram of a song waveform mastered back in the 70's compared to a song waveform mastered today. The 70's mix was mastered very conservatively. The wave form for the new mix was..."Hard Limiting" preset all the way.
Good Luck,
Jingleman