Thanks guys, DixieII+ actually seems a very powerful option, and I'm considering traditional LFO&ADSR modules too.
Lugia you're right, but to make a long story short, removing PICO System III is unfortunately not an option (at least for now).
I'll check Intellijel Noise Tools opportunities; thanks for pointing it out.
Is there any suggestion for a module to build ambient drone and pads ? Maybe a granular synthesis tool ? (I am looking at MI clouds clone - not so easy to found in europe - or morphagene).
Thanks again for your help