Buffer+pad design is this correct?

[geso]

I have created a buffer, copied from the Boss MT pedal buffer, and added a trimmer to the output as well. I measured the in and outgoing signal, it seems to work, but there are 2 things I would like to have clarified before I plug this into my soundcard:

1. On the layered image, where you can see the back and the front of the vero board at the same time, I marked two stripes with green X. They are the stripes of the Drain and Source of the J112 transistor. Those are the two stripes where the meter beeps when I check if there is touching between the soldering and the stripes. Other stripes are okay, but those two beep. When I remove the transistor the beep stops. So either the beeping is normal, or every time I solder it, the soldering touches the adjacent stripe. It is normal that the signal can jump like that between the S and D of that transistor?

2. Maybe me measurements were wrong, but it seems if I turn the trimmer to max, there is no reduction on the output. Maybe I interpreted it wrongly, but isn't it the case that the outgoing signal should be reduced even without the trimmer, and the trimmer just adds more reduction?

Sorry that the values are backwards in the plan, I had to mirror it before I started building.

 

[BuddytheReow]

There's probably a solder bridge somewhere. Can we see the back of the vero? It would be a good idea to run your iron down the tracks to clean them up.

 

[geso]

So the tracks concerned are the one between the two red cables near the top, and the one below it. Those have the D and S leg of the transistor. If I remove the transistor only from those tracks, the beeping stops.