Fast, clean MDMA-like onset

2. T+00:20:00 [intensity]

intensity 

± PLUS/MINUS — Threshold — something may be present, but it's right at the edge of perception. A stronger experience would confirm it; otherwise it may be nothing.

3. T+00:35:00 [intensity]

intensity 

+ PLUS ONE — Clearly noticeable. You can tell when it began and how it's changing, though its full character isn't apparent yet.

4. T+00:00:00 [note]

First awareness came at twenty minutes, climbing to roughly a plus two-and-a-half by half an hour. There was no jaw tension or stomach trouble, and open-eye colors appeared vivid, though closed eyes showed nothing. Apart from missing the enveloping quiet the writer usually gets from MDMA, the two might have been indistinguishable in a blind comparison.