as for how to use it, there's no easy road although Infyuthsion has quite a few easy-to-follow tutorials on how to use it i think...mostly, mastering the snths will mostly entail immersion of the self into the instrument, it takes time and practice to learn to use it well, but the payoff is great :D
oulv is short for "pulverisateur", the synthesizer instrument in the Audiotool app, at a closer look, its an analog style synth while its brother (or sister) the Heisenberg is a digital synth...although technically speaking, the Heisenberg is actually PM synth (pulse modulation i think?)