Affinity Photo: is it possible to change the brush width while painting?

[Tormy]

Starting to pain the line with a width and enlarge the brush while painting to create a crescendo thickness.

Is it possible?

I tried by keeping down CTRL+ALT while painting, but t doesn't happen anything.

[h_d]

If you edit a round brush (I used the 29px), go to Dynamics and set the Size Jitter to a fairly high figure controlled by Distance:

 

You can paint strokes like this:

It's not very controllable though: you'd probably have better luck with a graphics tablet and the controller set to Pressure.

[Ron P.]

Try clicking on the More button in the Context toolbar for the brush. Then go to the Dynamics tab and move the Size Jitter up to 100%

Edited

h_d was just a little faster..