EFM HH mainly parameter lock on decay tremolo pitch and feedback, feedback can transform the a hit hat sound as a voice sound ...
GND IMP with lot of filter and sample rate reduction !
i have use the trx bd too much time before, now use it mainly for bass sound, not for kick (except for layering a rom kick sample), but generalyy i prefer now use the efm bd.
EFM BD layered with the TRX B2 = my favorite seriously hittin and DEEP bass drum!!
Also I generally always put some LPF on both bass drums. AND, most importantly, HPF everything else!!! A little HPF on the snare drum, a lot of HPF on the hats, and some HPF to taste on your fx and whatnot. Clears out the sub freq's for your BD's = more Boom! Actually, that's a very important tip for any mix (it's the first thing I do on any mix). But it also helps to do it inside the MD.
I use EFM hihats a lot, love the way it could be tuned if you remove all the feedback ( FB )
I start with a short decay and full FB EFM hihat
Put a trig on the uptempo steps (you know 3,7,11,15)
Then p-lock FB, decay in those steps
After that I porogram another line over it, in the same track....something that could be a complementary with the uptempo one but adds another rythmic feeling
Save the kit
Now turn down FB at all, rise decay and p-lock the non-uptempo steps to make a melodic line
Press FUNCTION + CLASSIC/EXTENDED to bring back the original FB + decay settings for all the steps (p-locks still there)
Last: p-lock volume for the uptempo steps
Now when you´re playing you get a mutable but controlled hh line,
turn down volume and you get a more dancefloor feeling
rise decay and all the setps but the downtempo ones rise in lenght,turn down FB and over your dance hihats appears a melodic line that has the hh rithmic sequence but without loosing the uptempo ones...is great to make it live so people could hear the HH mutate into a sequence and back but without loose the more rythmic hihats