Considering Sample Tank 3 - opinions?

I’m a novice and I must be doing something very wrong - it can’t be that it is not possible (or extremely tedious) to create multiple tracks in Cubasis from Sample Tank – or can it?

I’m using Cubasis 2 with Sample Tank into which I’ve loaded the Miroslav package and Im trying to use multiple (4 to orchestral) numbers of Miroslav tracks. When I try to add a second MIDI track I get an error message. The various different methods around this (freezing, using audio tracks instead) have not worked for me - maybe my error.

But I think I’m doing something wrong because you guys talk about using Sample Tank as if there are no fundamental problems like this.

What am I doing wrong here?