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<h2 class="title"><a id="tclcsound"></a>TclCsound</h2>
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<p>
TclCsound was introduced to provide a simple scripting interface to Csound.
Tcl is a simple language that is easy to extend and provide nice facilities such as easy file
access and TCP networking. With its Tk component, it can also handle a graphic and event interface.
TclCsound provides three ‘points of contact' with Tcl: </p>
<p>1. a csound-aware tcl interpreter (cstclsh) </p>
<p>2. a csound-aware windowing shell (cswish) </p>
<p>3. a csound commands module for Tcl/Tk (tclcsound dynamic lib) </p>
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<h2 class="title" style="clear: both"><a id="tclcsh"></a>The Tcl interpreter: cstclsh </h2>
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<p>With cstclsh, it is possible to have interactive control over a csound performance.
The command starts an interactive shell, which holds an instance of Csound.
A number of commands can then be used to control it. For instance, the following
command can compile csound code and load it in memory ready for performance: </p>
<pre class="programlisting">csCompile -odac <span class="emphasis"><em>orchestra</em></span> <span class="emphasis"><em>score</em></span> -m0 </pre>
<p>Once this is done, performance can be started in two ways: using csPlay or csPerform . The command </p>
<pre class="programlisting">csPlay </pre>
<p>will start the Csound performance in a separate thread and return to the cstclsh prompt.
A number of commands can then be used to control Csound. For instance, </p>
<pre class="programlisting">csPause </pre>
<p>will pause performance; and </p>
<pre class="programlisting">csRewind </pre>
<p>will rewind to the beginning of the note-list. The csNote, csTable and
csEvent commands can be used to add Csound score events to the performance, on-the-fly.
The csPerform command, as opposed to csPlay , will not launch a separate thread, but will run Csound in
the same thread, returning only when the performance is finished. A variety of other commands exist,
providing full control of Csound. </p>
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