Re: I don't remember how to do this ...

[Gilles Sadowski]

Hi.

> [...]
> realized that the notes are one step too high. 
> [...]

If I understood correctly, you just need to use "\transpose":

>
> % ------ Trombone 1------
> tbonea = { all the notes of the piece }
> trombonea = \relative c {
>  \global
>  \key f \major
>  \set Staff.instrumentName = #"Trombone 1"
>  \set Staff.shortInstrumentName = #"Tbn 1"
>  \clef bass
   \transpose d c { \tbonea }
> }
>
> % ------ Trombone 2------
> tboneb= { all the notes of the piece }
> tromboneb = \relative c {
>  \global
>  \key f \major
>  \set Staff.instrumentName = #"Trombone 2"
>  \set Staff.shortInstrumentName = #"Tbn 2"
>  \clef bass
   \transpose d c { \tboneb }
> }

But if you also want to keep the same pitch (as without the transposition),
you also need "\transposition":

  \transposition bes { \transpose d c { \tboneb } }


Best,
Gilles