okay, here goes

JJ theme: It's great, really. But there are a few minor flaws. For one, the panning seems to shift to the right overall, slightly. Percussion sounds very good, but could use more variation. The 'chorus' would sound much, much better if you just made the percussion stronger in there. Also, scratching during the sax solo is a bit bland. Maybe it needs a better sample or just isn't smooth enough, I'm not sure.

Tubelectric: Lead thingie would sound much better with some note transitions and portamentos. Bass isn't heavy enough compared to the rest of the song. The guitar solo thing came out very cool.

Colonius: Good scratch sample this time, but its rhytm isn't suiting well enough. Also, in the main melody (that used to be on mandolin and now is on piano) there's this note that 'kicks in' with volume - it doesn't sound so well on this instrument. Very good percussion, tho'.

Dark Knight: Great samples (RARGH ME WANTS), great volume and panning balance, moody, touching, etc. But there's one problem... It's definately too simple in progression for listening alone, also a bit repetitive. Yet, for a game or movie, this would no doubt be awesome. But if you're going to add more sections as you say, this song can turn out extremely great even on its own.

Diamondus: Uh... This one stands out from the rest. It's fun, but doesn't have this 'pro' sound to it the previous tracks have. Not much seems to be changed, anyway...