how do i save - when:

i want to first to create songs out of sequences (vers, chorus , bridge) and later plan to load several songs into ram for live performing....

Should i save songs ? But what about FX setings - are they save with the song? or only globaly?

Also if i call all BD´s just BD - they will be overwritten when i load an additional song with a new sample called BD?

I'm not really sure what you mean but i do know if you have something by one name in ram and you load the same name something in on top of that the first one will be overwritten i.e. file "exsists rename or replace". you should probably give all your samples different names to avoid any complications like that, I've been where you are coming from