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Sound Card Frequency Modulation (FM)
This button brings up the Frequency Modulation dialog, and is shown depressed when FM is activated for this stream. The actual FM toggle button is at the top of the opened dialog.
Frequency modulation is when the frequency of one signal (the 'carrier') is controlled (modulated) by the instantaneous value of another (the 'modulator'). Moving the slider on a child's slide whistle modulates the pitch (frequency); here we are effectively moving the slider automatically.
'Vibrato' in music is a form of frequency modulation, although in real-world instruments and voices there is often a certain amount of amplitude modulation ('tremolo') added by the vibrato mechanism. Vibrato typically involves a modulation rate of several hertz.
If the Stream dialog is open, FMdlg=1 opens the FM dialog, FMdlg=0 closes it, and FMdlg=x toggles between open and closed.
Note that you do not need to open the FM dialog to change any of its controls directly via macro command.
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