AAS Player is a straight rompler, no tweaking required indeed.
Except the possibility to alter the volume setting there is really no way to personalize the presets, there is no options for layering, neither are simple effects like reverb, chorus or filter cutoff present.
The presets are pretty good, showcased by the free Swatches collection, they consist of "bread and butter" sounds suitable for most styles of music.
But as there is no way of shaping the presets in any way they can easily be recognized in the mix, and thus be in danger of becoming dated pretty quickly.
So like a linear video game, once you have played through it there is really not much to come back to here, unless you invest in further expansion packs at $39 a pop.