- 2, 2, 0, (SCM n, SCM d, SCM gn, SCM gd),
- "Create the rational number with main timing @var{n}/@var{d},"
- " and optional grace timing @var{gn}/@var{gd}.\n"
- "\n"
- "A @dfn{moment} is a point in musical time. It consists of"
- " a pair of rationals (@var{m},@tie{}@var{g}), where @var{m} is"
- " the timing for the main notes, and @var{g} the timing for"
- " grace notes. In absence of grace notes, @var{g}@tie{}is zero.")
+ 1, 3, 0, (SCM m, SCM g, SCM gn, SCM gd),
+ "Create the moment with rational main timing @var{m},"
+ " and optional grace timing @var{g}.\n"
+ "\n"
+ "A @dfn{moment} is a point in musical time. It consists of"
+ " a pair of rationals (@var{m},@tie{}@var{g}), where @var{m} is"
+ " the timing for the main notes, and @var{g} the timing for"
+ " grace notes. In absence of grace notes, @var{g}@tie{}is zero.\n"
+ "\n"
+ "For compatibility reasons, it is possible to write two"
+ " numbers specifying numerator and denominator instead of"
+ " the rationals. These forms cannot be mixed, and the two-"
+ "argument form is disambiguated by the sign of the second"
+ " argument: if it is positive, it can only be a denominator"
+ " and not a grace timing."
+ )