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<H1><A NAME="SECTION002700000000000000000"></A>
<A NAME="sec-after"></A>
<BR>
After
</H1>
<P>
In the previous chapter on T<SMALL>RIGGERS</SMALL> we discussed how you can
set an event to occur when a certain chord change occurred. This
chapter, A<SMALL>FTER</SMALL>, discusses a similar concept: setting an event
to occur after a certain number of bars have been processed.
<P>
The A<SMALL>FTER</SMALL> command is used to set a
<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> at some point in the
future. This can be handy when you have set a portion of your song up
in a macro and wish to make changes to volume, tempo, etc. during the
expansion of the macro.
<P>
For example, let's assume you have a short piece of music set up in
the macro $LNS:
<P>
<Table Hspace="40%" CellSpacing=0 CellPadding=10 BGColor="OldLace" Border=3>
<tr><td>
<B>Mset Lns
<BR> Am
<BR> C
<BR> Dm
<BR> E
<BR>
EndMset </B>
</td></tr>
</Table>
<P>
and we incorporate this into a
<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> script in a number of places.
However, at some point we want the T<SMALL>EMPO</SMALL> to slow for the final
two bars. Using A<SMALL>FTER</SMALL> we can do:
<P>
<Table Hspace="40%" CellSpacing=0 CellPadding=10 BGColor="OldLace" Border=3>
<tr><td>
<B>After Count=2 Tempo *.9
<BR>$LNS </B>
</td></tr>
</Table>
<P>
And have the command T<SMALL>EMPO *.9</SMALL> inserted between the second and
third bars.
<P>
A<SMALL>FTER</SMALL> has a number of options, all of which are set in
option=value pairs:
<P>
<DL COMPACT>
<DT></DT>
<DD><DL>
<DT><STRONG>Bar</STRONG></DT>
<DD>Specifies the bar number for the event to trigger. Note,
this is the value of the bar as it is created; it is not the
``comment'' bar number which optionally starts a chord line.
<P>
A special case option is the use of EOF as a pseudo line
number. In this case the command is appended to the end of the
<SPAN CLASS="textbf">current</SPAN> file. You can not delete an event set with
B<SMALL>AR=</SMALL>E<SMALL>OF</SMALL>. You might think of this as a dynamic <SMALL>MMAEND</SMALL>
<A HREF="node32.html#sec-mmaend">(here)</A>. For a ``real
life'' example of this option, see the qriff plugin supplied with
this version of
<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> .
<P>
</DD>
<DT><STRONG>Count</STRONG></DT>
<DD>This is the easist and most used option. It sets the number of bars to
process before executing the command.
<P>
</DD>
<DT><STRONG>ID</STRONG></DT>
<DD>Set a string to use as an identifier for the A<SMALL>FTER</SMALL> event.
<P>
</DD>
<DT><STRONG>Remove</STRONG></DT>
<DD>A active event line can be removed using this option.
For example, if you have an event named ``Happy'' you can delete it
using the command:
<P>
<Table Hspace="40%" CellSpacing=0 CellPadding=10 BGColor="OldLace" Border=3>
<tr><td>
<B>After Remove=Happy </B>
</td></tr>
</Table>
<P>
Any other commands will be ignored. A warning will be printed.
<P>
</DD>
<DT><STRONG>Repeat</STRONG></DT>
<DD>Using this option you can set an event to reoccur at a
regular interval. Very simply:
<P>
<Table Hspace="40%" CellSpacing=0 CellPadding=10 BGColor="OldLace" Border=3>
<tr><td>
<B>After Repeat=4 Print another four bars </B>
</td></tr>
</Table>
<P>
will display a silly message after every four bars are processed.
<P>
</DD>
</DL>
</DD>
</DL>
<P>
Anything left on the command line after processing the options is assumed to be a valid
<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> command.<A NAME="tex2html115"
HREF="#foot16384"><SUP><SPAN CLASS="arabic">27</SPAN>.<SPAN CLASS="arabic">1</SPAN></SUP></A>
<P>
A number of short examples of are contained in the <TT><SPAN CLASS="textbf">egs/after</SPAN></TT> directory.
<P>
You can have any number of A<SMALL>FTER</SMALL> event lines. Each is checked
in the order found before every line of your
<FONT Face="Serif" Color="Navy"><I>MMA</I></FONT> file is processed.
<P>
Events using the C<SMALL>OUNT</SMALL> and B<SMALL>AR</SMALL> options are automatically
deleted once they have been used. Events created with the
R<SMALL>EPEAT</SMALL> option will continue to be active until they are removed
with a R<SMALL>EMOVE</SMALL> command.
<P>
Using the command line options <B>-e</B> and <B>-r</B> and copious
P<SMALL>RINT</SMALL> statements (yes, you can use A<SMALL>FTER</SMALL> for this!) will
help you determine the exact event locations.
<BR><HR><H4>Footnotes</H4>
<DL>
<DT><A NAME="foot16384">... command.</A><A
HREF="node27.html#tex2html115"><SUP><SPAN CLASS="arabic">27</SPAN>.<SPAN CLASS="arabic">1</SPAN></SUP></A></DT>
<DD>The parsing occurs the option pairs are
<B>extracted</B> from the input line and any remaining tokens are
glued back together. So, you <B>can</B> have your options inserted
inside the command ...but this is not recommend!
</DD>
</DL>
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<ADDRESS>
Bob van der Poel
2016-06-11
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