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## Re: wah-wah-effect

 From: Alexander Kobel Subject: Re: wah-wah-effect Date: Sun, 27 Dec 2009 20:15:34 +0100 User-agent: Thunderbird 2.0.0.23 (X11/20090817)

```Alexander Kobel wrote:
```
```Hi, Stefan,

```
you could try to experiment with Hairpin #'stencil. I imagine combining the usual stencil with a "+" markup at the right side should work. Have a look for the ly:stencil-combine-at-edge and ly:text-interface::interpret-markup (other possibilities exist, of course; you can draw a "+" or a circle outside of a text block, but this looks quite easy) functions. You'll find examples for both functions here on the list, or in the LSR.
```

```
Actually, the LSR nearly has the correct function, so it wasn't too much work to figure it out:
```

%% idea from: http://lsr.dsi.unimi.it/LSR/Item?id=233

hairpinPlus = \once \override Voice.Hairpin #'stencil =
#(lambda (grob)
(ly:stencil-aligned-to
(ly:stencil-combine-at-edge
(ly:stencil-aligned-to (ly:hairpin::print grob) Y CENTER)
X RIGHT
```
(ly:stencil-aligned-to (grob-interpret-markup grob (markup "+")) Y CENTER))
```   Y CENTER))

\layout { ragged-right = ##f }
\relative c' {
\hairpinPlus
c2\< c\!
}

I didn't know about grob-interpret-markup. Well, that's a great shortcut!

Cheers,
Alexander

```