Cswish: the windowing shell
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## Cswish: the windowing shell

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:

    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

Similarly, it is possible to bind keys to commands so that the computer keyboard can be used to play Csound.

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.

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