LADSPA Crossfade 2 Channels vs 4 Channels

I downloaded the LADSPA Crossfade plugin but when I tried to apply it to my clip, it gave this error. What does it mean by 4 Channels instead of 2?

Side question: Is this the best way to have a crossfade effect in Kdenlive or would you know of a better plugin for this?

xfade2

I don’t know this effect at all, but I guess it requires 4 audio channels. You can do a crossfade (I think?) between audio clips by putting them next to each other on a track, selecting them and pressing “u”.

Sweet! I’ve been looking for that for forever!
Thanks.