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<p>With Cswish, Tk widgets and commands can be used to provide graphical
interface and event handling. As with cstclsh, running the cswish command also opens an
interactive shell. For instance, the following commands can be used to create a transport
control panel for Csound: </p>
<pre class="programlisting">frame .fr
button .fr.play -text play -command csPlay
button .fr.pause -text pause -command csPause
button .fr.rew -text rew -command csRewind
pack .fr .fr.play .fr.pause .fr.rew </pre>
<p>Similarly, it is possible to bind keys to commands so that the computer keyboard can be
used to play Csound. </p>
<p>Particularly useful are the control channel commands that TclCsound provides.
For instance, named IO channels can be registered with TclCsound and these can be used with the
invalue, outvalue opcodes. In addition, the Csound API also provides a complete software bus for audio,
control and string channels. It is possible in TclCsound to access control and string bus channels
(the audio bus is not implemented, as Tcl is not able to handle such data).
With these TclCsound commands, Tk widgets can be easily connected to synthesis parameters. </p>
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media
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core-release
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