In sample loops, does anyone know how to fix those harmonics and volume issues that appear when I do crossfading?
The harmonics and volume variations etc. relating to looping is dependent on your audio sample.
Crossfade is fading in audio copied from before the loop to the loop end.
Please see a video on looping below. Would be wise to follow the steps in the video, and in worst cases you might want to try the loop tone uniformizer.
If you are new to looping, I recommend you watch “The Lost Art Of Looping” - Dan Worrall on Youtube even though it is not WL related.
Hola, muchisimas gracias por la respuesta, aprendi un monton con esos videos y ahora si ya solucione mi problema.