Help with double scene cross fade of cue list/sequence

Greetings to all. Having some trouble with old school method. I’m being asked to crossfade a sequence/cue list with the AB crossfade. Both faders up: fader A cue X+1 upfade/ fader B cue X down fades. Both faders down, next cue fade up with previous fade down. But I must be able to keep both cues up if faders in different position.
Any advice? Sorry if the english ain’t right, thanks in advance.