The default is either 64 or 100, I forget which, but I think it's 64; but when you change it to 127, everything sounds like it's being hit as hard as possible. If I'm correct about 64 being the default value, then lower values (below 64) with subdue the notes somewhat, and higher values (above 64). I think the Genos 2 style control actually uses an expression range so that you don't get instrument voices dropping out completely, they're just played more softly
Which doesn't answer the OP's question, which is:
in your style, during the crescendo (ending? INtro?) subdivide according to the lenght (so if it's a 1 bar fill, and you want to hit the cresc *before* the last tick count, let's say you want it on the 4th beat, then subdivide from 1,1 (bar 1, beat 1, tick 0) to 1,4 and I'd use 1/8th notes to give yourself a 'ramp' of 7 volume changes. For example 1.1.0000 exp0; 1.1.960 exp 21; 1.2.0000 exp 42; 1.2.960 exp 64; 1.3.000 exp 85, etc
It might not be enough, might need to subdivide to 16th notes and use a ramp of 13 volume changes.
On the other hand, if you're using an 8 bar intro, and you want to go from 0 to full at the beginning of the last bar (start of bar
you now have a ramp of 16 if you add a exp control every half note
Mark