Re: changes.tely: deal with \transposition and instrumentTransposition changes (issue 7404046)

[Keith OHara]

On Wed, 27 Feb 2013 00:47:21 -0800, <address@hidden> wrote:

> On 2013/02/27 07:40:59, Keith wrote:
>
> > Oops.  It was \oldTransposition  but it was not put into LilyPond.
>
> Since the sign of instrumentTransposition has been inverted, it would
> require serious trickery or a separate music event type to implement
> \oldTransposition with the previous semantics.

The \oldTransposition you suggested in <https://codereview.appspot.com/7303057> 
has the required trickery, and I just re-checked that it works fine.

If I have time I'll point to it in changes.tely, just in case someone used the 
old method for something too complicated to easily convert by hand.

> Getting the previous
> semantics for instrument definitions seems even worse.

Probably no-one has used \addInstrumentDefinition for transposition, but if 
someone has, the instrumentTransposition assignments already use ly:make-pitch, 
so inserting ly:pitch-negate is not too much work.