Pralls and alterations

[Maurizio Tomasi]

I need to typeset a prall with a small alteration above it. I found this
is suitable:

------------------------------------------------------------------------
a4^\prall^#'(music "accidentals-1")
------------------------------------------------------------------------

but the sharp above the note is too big. How can I select a smaller font
for the sharp only?

Another question about this: if one want to print an alteration both above
and below a turn? I tried the following:

------------------------------------------------------------------------
\score {
        \context Staff \notes \relative g'' {
                 \key es \major
                 g8.^#'(music "accidentals-1")^\turn^#'(music
"accidentals-0")
                 a16 bes4 r2
        }
}
------------------------------------------------------------------------

but the sharp comes above the turn, not below!

Could somebody help me, please?

Maurizio