I require a dynamic way to change the attack when a note is played. The attack needs to be longer when the note is long and vice-versa. But is it possible though? Atleast in realtime? Cause I have this theory that in realtime the synth is only receiving what the daw is providing and not the whole midi pattern, my theory might be wrong though.
If you want to do that for recorded midi your daw must offer a modulator for that.
That’s not really real time, like that’s understood as happening without perceptible delay, like as-if there’s no latency. I think you mean dynamically.
Hey! Thanks for the reply. Yeah so I don’t think it’s possible at all, the daw is like human player which is just giving the synth realtime signal just as a real player.
I think there’s no way for the daw to pre-input the whole midi. Sadly I’m gonna have to manually automate the attack for now.
The daw should have its own modulator that’s tied to the length of the midi note to do that. No synth has a modulator called “note length”, not does midi standard have that message, but midi standard is quite outdated anyway.
Are you in Ableton or Bitwig?
You can definitely do that with mapping a couple midi devices as Herman mentions
Can you teach me? I’m using a dying DAW, Cakewalk.
Sadly, I’m in Cakewalk. Is it possible?
Apologies never used Cakewalk 
, you could try asking on their forums though
But I think Cakewalk Sonar may be able to?
Or if you can edit MPE data you can automate it and then might be able to find a workaround with mapping pressure or something to say the attack time