Re: HELP: Trill line without 'tr' written before it

[Simon Albrecht]

Hi George,

On 16.03.2016 11:21, George wrote:
> this creates a trill line above the note
> (I'd like it to appear on the stave) with 'tr' written before it
> (I'd like the zig-zag line to appear directly
> after the note head, with no extra text,
> just the line.)
>
> How can I accomplish this?

Have a look at the following:

%%%%%%%%%%
\version "2.18.2"
myStartTrillSpan =
-\tweak bound-details.left.text ##f % no text
-\tweak outside-staff-priority ##f % inside staff
-\tweak Y-offset 0 % v-center
-\tweak bound-details.left.padding 1 % add padding to the left and right
-\tweak bound-details.right.padding 1
-\tweak minimum-length 5 % minimum length – requires the following line
-\tweak springs-and-rods #ly:spanner::set-spacing-rods
\startTrillSpan

\new DrumStaff \with {
  instrumentName = #"Güiro"
  shortInstrumentName = #"Guir."
  \override StaffSymbol.line-count = 1
  \override NoteHead.style = #'cross
}
{
  r4 c4\myStartTrillSpan e8\stopTrillSpan c8 c4 |
}
%%%%%%%%%%%%

I made some more suggestions for simplifying the code: e.g. by further 
exploiting use of the \with{} block, and deleting the trailing spaces in 
(short)instrumentName.

Best, Simon