Re: Halving/doubling durations

[David Kastrup]

address@hidden writes:

> Hi Folks,
>    Lots of older music is written in 4/2 or 3/2 time, and uses minims
>    as the standard note.  I'd like to be able to enter it exactly for
>    proof reading, then halve all the note values (and the time
>    signature) so the main melody is in crotchets instead of minims.
>
>    Example, the old Hymn Tune, `All Saints'
>
> \score {
>         \new Staff \relative c'' {
>              \key bes \major  \time 4/2
>              bes2 f g g |
>              f es d4( c) bes2
>            }
> }
>
> I'd like to convert this automatically to
>
> \score {
>         \new Staff \relative c'' {
>              \key bes \major  \time 4/4
>              bes4 f g g |
>              f es d8( c) bes4
>         }
> }
>
> by something like
>    \halveDurations { music ... }
>
>
> It'd be fairly easy to write a music function that does this,  but I
> wanted to ask first if there was one already existing I could use.

\shiftDurations #1 #0 { music ... }

-- 
David Kastrup