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
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