If done in the right order, MDMA will overpower any minor trip drug like 6-apb. I've had MDMA overpower way stronger trip drugs, the key is to take far more of the MDMA than you would the tripping drug, and to take the MDMA at the right time. Which I honestly don't remember if it's before or after. I think even if you do them simultaneously the MDMA will overpower the trip drug (but you will STILL be way more fucked up than just MDMA alone...you will be trolling balls if you do enough of both..but what I mean by overpowers is that you can still feel the MDMA's effects, usually making a bad trip to be a good trip.
Well about alcohol decreasing a roll. I do agree to a point. But it depends on the person. For me after a while, I needed to drink alcohol when I Rolled, or else I would not even barely feel the roll. The alcohol made the roll's stronger for me after getting used to doing it like that. I think a lot of this has to due with tolerence issues as it was the opposite for me when I first started rolling. I believe beginners to mdma should not drink with it. In fact no one should because it puts a lot of strain on your liver. I did some damage to my liver over the years by doing that. You can easily drink a 12 pack while rolling, even if you're a lightweight. I also found alcohol helps a LOT with the mdma comedown. If you drink a couple beers once you start coming down, it brings you back up (smoke some pot too of course is essential) to the point of gradually coming down until you fall asleep. I'm sure some people will be different than me, but I'm speaking from my own experience. (Weed+alcohol=MDMA's comedown's best friend) Just make sure to drink a lot of water too, so you dont get dehydrated too much or get a headache. Also I never normally went to clubs or raves, so I usually just chilled when I rolled. I would think the alcohol would dehydrated you faster if you were out actively dancing at a club or something.
But all that aside, I Tried the 6-apb/4-FA combo...and boy was it good. The hangover wasn't that bad at all (I was expecting much worse) I did about (and I eyeballed it so this is just an estimate) two different doses of about 125 mg's of 4-FA. At the 2nd dose, I also put a SMALL amount of 6-apb in a cup of water. I drank only half of it...and thats all I needed. I'd say I took less than 50 mg's of 6-apb if I had to estimate. And it just made the 4-FA that much better. I started rolling balls, It felt almost identical to MDMA...but a bit stronger with different body effects. But yeah it was just like rolling. Way more than just taking 6-apb on it's own. Which I dont even consider 6-apb to be a "Rolling" drug. It is a tripping drug (psychedelic) in my experiences with it. But combined with 4-FA it really does feel like rolling. Even more so than taking a high dose of 4-FA on it's own. So I did the 4-FA first, was feeling really good, but when I added in the 6-apb I started literally "Rolling" which was on par (just as good) as an MDMA experience. I dont really remember how long it lasted. I also drank about 6 beers with it and smoked some weed, so I really dont remember much from the night, other than how good the music sounded and how good my body felt. It was like pure ecstasy.