can I get vertical scroll on a SSD1306?

Hi,
I am trying to get a SSD1306 display from adafruit to do a vertical scroll.
I can get it to horizontal scroll and diagonal scroll but can't see how to vertical scroll.
I have affixed the library .h file but I must admit I am not that good at reading them.
It does say

#define SSD1306_SET_VERTICAL_SCROLL_AREA 0xA3

but it says nothing about vertical lower down with

void startscrollright(uint8_t start, uint8_t stop);
void startscrollleft(uint8_t start, uint8_t stop);
void startscrolldiagright(uint8_t start, uint8_t stop);
void startscrolldiagleft(uint8_t start, uint8_t stop);

Is there any way of vertical scrolling?
I have also added the .cpp file for good measure.
Thanks,
Bob.

Adafruit_SSD1306.h (5.82 KB)

Adafruit_SSD1306.cpp (24.2 KB)