Re: tremolo

[Noeck]

Dear Ursus,

this is how I would write it:

\version "2.19.80"

{
  \clef bass
  \key a \major
  \time 12/8

  \set tieWaitForNote = ##t
  \override Beam.gap-count = 2
  \repeat tremolo 12 {a,,32\fermata ~ a,\fermata ~ }
  <a,, a,>8 r r r4 r8
  \bar "|."
}

You need 12 repetitions (12 times a 1/32 note is 3/8 or 4. and two 4.
are a dotted half note as you want here).

The beam gap is certainly optional (you can delete this line).

Best,
Joram