You might look at Keyscape.. this vid is not about acoustic sounds, but a blind test that turns out in favor of software, coming from a company that makes most of their money selling hardware, wins big credibility points (Jack is great).

Supposedly Keyscape has good acoustic piano as well.

https://www.youtube.com/watch?v=FSamnzXl5J8

I had a Prophet 12 for a short while, and I'd agree that the Summit resembles it in tonal character.  But the Poly Evolver is a most unique instrument.  It can certainly sound nasty if you ask it to, but it also is capable of the sweetest richness and warmth.  I've found it unexpectedly to be a very difficult instrument to replace, however hard I try.

I think the P12 is a more apt comparison than the PEK. I've owned a Peak, Evolver, and P12 module. Both DSI instruments are dirtier and have more character. The Peak sounds great and has a much better layout than the other two, but the filter didn't strike me as anything special. Although I prefer it to the extremely bland Waldorf Quantum that I briefly owned. The PX stereo filters are the best of the bunch (in that hybrid field), but I don't prefer them to the P6, P5/P10, or OB-6 filters.

I'm going to wait for the P12 successor that hopefully has SSI2140 filters.

I ordered a set of the end panels from @SynthWolf for my Prophet 6. They arrived yesterday and are really wonderful. Quite beautiful and so smooth to the touch. 10/10!

Thanks guys !!! So it is "normal" yes for me the module seems to work also!!!