Change synth velocity with variable not working

I got some help with this already but can’t get it working…
Sound quality for the video is bad, that’s just the capture I’m using though.

Two synths set to timers that trigger when the player enters a trigger box - the first synth plays random notes from a scale, the second plays a single repeated note. The second synth begins at velocity 0, then when F is pressed it should switch to 120, and vice versa.

Trying to change the velocity variable of the second synth with a key press. It seems like the velocity variable is changing as I want it to, because the string is printing correctly but it’s not actually changing the audible volume of the synth. When I press F the velocity integer seems to be switching between 0 and 120 but I can’t hear the second note that’s on a timer.