shifts the pitch down. You cannot
     slide beyond the note C1 (period 856).

[14][3]: Set glissando on/off
     Where [14][3][x] means "set glissando ON if x is 1, OFF if x is 0".
     Used in conjunction with [3] ('Slide to note'). If glissando is on,
     then 'Slide to note' will slide in semitones, otherwise will
     perform the default smooth slide.

[14][4]: Set vibrato waveform
     Where [14][4][x] means "set the waveform of succeeding 'vibrato'
     effects to wave #x". [4] is the 'vibrato' effe