Slide the note pitch from the current pitch to the given note pitch at the rate
of para each tick. You can keep on sliding without having to specify a new
para nor a new note.
The goal is reset to 0 when reached, so if you reach the note, no Tone
portamento without a goal will have an effect.
You can change the rate without having to specify a new note.
If you specify a new note, the current pitch is used as a starting point,
not the previous goal or anything like that.
A Tone portamento when the goal is already reached has no effect.
If Glissando control has been applied, the pitch is rounded to the nearest note for the actual sound output, but this value is not stored anywhere, and has not any other influence on the player's behaviour.
Scrolling mode:
1 --> A-4 ( 5)
sample number/-->note to slide(rate of slide)