    slide beyond the note B3 (period 113).

[2]: Slide down
     Where [2][x][y] means "smoothly increase the period of current
     sample by x*16+y after each tick in the division". Similar to [1],
     but lowers the pitch. You cannot slide beyond the note C1 (period
     856).

[3]: Slide to note
     Where [3][x][y] means "smoothly change the period of current sample
     by x*16+y after each tick in the division, never sliding beyond
     current period". Any note in this channel's division is not pla