this guy has made me several bits of kit
chk out this .... one of is noize boxes
http://uk.youtube.com/watch?v=5DOCqjWHfaw

i own both of the sirens
its horses for courses
oceanus siren has a huge range of sounds but requires a bit of playin
the phonic potion siren has a more limited set of soundz but they are
more available.

when oceanus and i discusssed the siren i asked for him 2use siren soundz and drum synth ...