Re: duration using variable

[Graham King]

On Wed, 2016-04-27 at 13:02 +0200, David Kastrup wrote:
> Graham King <address@hidden> writes:
>
> > perhaps try:
> > \scaleDurations 2/1 { \cC }
>
> Doesn't change the visuals.
Sorry.  More haste, less speed.  I meant \shiftDurations.  It might require other things to be adjusted too: \time is given as an example here.  This code was developed some years ago, so there might be better ways of doing it now.

>     \version "2.19.40"
>     
>     music = { c'4 4 4 4 }
>     
>     { \time 4/4 \music }
>     
>     #(define RF 1) % 1 to double note values, 2 for unchanged, 4 for halved, etc.
>     
>     { \shiftDurations #(rationalize 
>                         (inexact->exact (- (/ (log RF) (log 2)) 1)) 1/10) #0
>       { \time #(cons 4 (* RF 2)) \music }
>     }