Change dynamics each repeat

[Alex Shultz]

Is there a way to show a change of dynamics on a repeat?

In the following example the first note in the repeated phrase is indicated
to be played forte. I want to be able to indicate that the second time it
should be played piano. I have seen this written as "f-p" but cannot figure
out how to do that here. Any ideas?

Example:
  \repeat volta 2 {
    f2\f f'
    f,2 f'
    e8 d c4 f,2
    bf4 d c2
    }
  \alternative { {f,2. f'4\p} {f,2. a4\mf} }

--
Alex Shultz