Obviously, you have never combined Delsym with any Robitussin products or generic products, it has something to do with DXM to DXO conversion, but I will tell you if you combine it, it is a much different experience than by itself. And you're telling me the doses to try?! I actually took 600 mg yesterday, then 420 mg an hour later right before it really hit me, and then another 300 mg an hour and a half - 2 hours later.
I have to say this was the highest dose I have taken, and still didn't really experience any hallucinations, but I did have EXTREME time dilation, like I would feel like I would be doing something and it would just skip and it would be awhile later.. I am not sure how to explain it. and everything seemed so surreal and mechanical, but it was definitely a worthy experience with some insight and was VERY VERY intense, I still feel it quite a bit actually, because of the high dose I took.. The marijuana I smoked this morning definitely exponentiated that factor.