Buiding tracks for ads is pretty difficult.  I like to compare it to fishing.  If the fish don't bite..the bait is no good.  But really..what it takes.. is to find a musican who can "hear" things to accompany.  I'm a bit sensitive abut posting "suggestions" as no two ears are alike..and I don't belive anyone needs to hear music thru my ears. Some others here think otherwise and belive we should tailor our work to meet their ears.  Sharing stems is awesome as one can hear other folks ideas.  Im not much into Reggae/Ska..but I do like to experiment.  If you want..send your stems to me..Mzinzer@Comcast.net and I can goof with it.  Lots of time on my hands...and thanks for sharing.  I will share my stems back with you so you can edit anything out you don't like.