tone_synth object
This method rewinds the cursor to a previous position in milliseconds.
bool rewind_ms(double time)
Parameters:
time
Number of milliseconds to rewind.
Return value:
true on success, false on failure.
Remarks:
Rewinding is useful if you want to go back to a certain position relative to where the cursor is at present.
Example:

    // Write a chord, two melody notes, then rewind to add some more.

    tone_synth synth;

    void main()
    {
    synth.waveform_type=2;
    synth.note_ms("C4", 2000);
    synth.note_ms("E4", 2000);
    synth.note_ms("G4", 2000);
    synth.waveform_type=3;
    synth.note_ms("C5", 1000);
    synth.rest_ms(1000);
    synth.note_ms("C6", 1000);
    synth.rewind_ms(666);
    synth.note_ms("E5", 333);
    synth.rest_ms(333);
    synth.note_ms("G5", 333);
    synth.rest_ms(333);
    synth.write_wave_file("synth.wav");
    }