Re: Adding durations (for \after)

[David Kastrup]

"Joel C. Salomon" <joelcsalomon@gmail.com> writes:

> <https://lilypond.org/doc/v2.23/Documentation/notation/writing-rhythms#scaling-durations>
> says:
>
>> Factors may also be added by using Scheme expressions evaluating to a
>> number or musical length like `*#(ly:music-length music)`.
>
> Is there an example of such addition handy?
>
> The stripped-down example below works, but `\after 8*9' would be
> better written `\after #( <something involving 2. and 4.> )`.
>
> The best I could glean from the documentation looks something like:
>
>   \after #(ly:moment-add (ly:make-duration 2 1) (ly:make-duration 4 1))
>
> ... except that yields a type error because I’m creating durations not
> moments.

Maybe something like

   \after #(make-duration-of-length (ly:music-length #{ 2. 4. #}))

Arguably it would make sense for \after to just accept example music as
the delay specification.

-- 
David Kastrup