[LongGone]

Its just a loose comparison; they are both different scales. But roughly speaking

**1=*21
**2=*22
**3=*23
**4=*24

The *scale goes from *1-*24, the ** (overjoy) scale goes from **1~**7

(There are expections though)

To me, **6 is the threshold where charts are "still designed to be feasibly cleared by humans"; with very hard patterns that look theoretically doable. **7 are usually joke dump/charts which only a couple have been ever cleared while the rest seems "impossible", although they might be compensated for by having a looser health gauge (unlike Stepmania, for each bms chart you can define how tight/loose you want the health gauge recovery to be)