When I view a texture in the genetica viewer, I see a varying number of 'effect maps' that have been used to generate that texture. These aren't changeable in the viewer.

Am I correct in assuming that to be able to play with the effect maps, combine them, mix them up, etc ... I need to buy the full version of Genetica?

If I don't really need all the 3d functionality of Genetica and am just interested in making textures, I'm guessing it probably isn't worth buying Genetica just for this rather than using effect layers in Photoshop CS4 (which I do own)?