So there’s the classic SPL Transient Designer, the Elysia Nvelope, and maybe just a couple more.
These apparently are not just 2 compressors in series but involve some serious interconnected dynamics stages. What is going on inside and can I approximate it using a couple compressors? I have a Presonus ACP88 which is 8 compressors in a rack…not super quality stuff, but I’m wondering if they can be used to similar effect.
I’ve used the Transient Master in Maschine software and I LOVE having independent control over the attack and sustain portions of a sample. What mojo is taking place in things like the Elysia Nvelope and is it worth investing in?
My final use-case is basically to have something like an Elysia Nvelope near my Rytm MKII in order to sample/resample sounds from any source with perfect percussive envelopes.
Thanks for any input!

If I were to try and recreate TD effects with other forms of dynamic processing, I think I would try this:
Use a gate on the signal that has a super short hold and release time to try and extract just the transient of the sound ( probably only works with drums and other percussive sounds)
On a separate track use a compressor with a super fast attack time and medium release and smash all the life out of the track. It won’t sound good in its own probably.
Take both those tracks and mix them in parallel with the track you want to process. Add them to the mix to add either attack or sustain. Phase reverse and then add them in to subtract attack or sustain. Use shelving eq on the processed signals to try and duplicate what the Nvelope does. GL 
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Damn that was a great response!! Thanks!!!
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Or you could use one of countless sample libraries where people have done the processing for you… the low budget, not fun option.