Have a look at the grooveduck.maxhelp example (in /examples/sequencing-looping/audio-rate-sequencing-looping). It's not a crossfade but a fast fadeout/fadein.

p

Hi to my ears, it appears that (loopinterp 1) indeed makes no difference, that is to say that I guess the new updated version of [groove~] has loop interpolation on as default (max 5.1.9). Patrick's reference to [grooveduck] still stands though; and he also raises a good point re terminology: in the context of your post, crossfade refers to two or more overlapping loops, with each having its own fade-in/out or "window/envelope". If this is what you're after, that is a little more involved, but with lots of resources including my own. A fade-in/out perhaps refers to windowing of a single repeating loop and I've attached a patch demonstrating this, with input for attack and decay in ms. Forgive the patronizing tone if this is all old news to you :)

Brendan EDIT added a curve function too; never liked [trapezoid]'s hard knees

Hey guys, how can i do to remove clicks when sliding window into the buffer through groove? Thank you in advance