instrumentSwitch/addInstrumentDefinition?

[Kieren MacMillan]

Hello all,

You may recall the problem(s) we were discussing earlier this year:
    <http://lists.gnu.org/archive/html/lilypond-user/2008-06/ 
msg00512.html>

In the docs, I found the \instrumentSwitch feature:
    <http://lilypond.org/doc/v2.12/Documentation/user/lilypond/ 
Writing-parts#Instrument-names>

Looks promising… but no documentation!?  =\

Anyone know what's going on in there?
I'd like to see if it solves the problem referenced above — if so,  
I'm happy to write up documentation for the benefit of others.

Thanks,
Kieren.