Any idea on how to achieve typical acid sound? Step designer? Only?
What is “typical acid sound”?
Many years ago while experimenting with acid I heard sounds of all sorts … none of which I would describe as “typical”. 
In fact, some of the most “typical” sounds did not sound (or feel) like anything from this world.
Guitar strings just kind of melting under my fingers …
I suspect, however, that you might be referring to something completely unrelated.
So … care to explain in a little more detail what it is you are trying to achieve?
Get a 303 VSTi.
I own ABL 2 from audiorealism and am very happy with it… 
But I guess there are quite some discussions over which is the best 303 plugin at kvraudio.com