Boss FV-500-L

I use the Boss FV500L for playing Lap Steel and Pedal Steel guitar (after a buffered pedal of course).
It is built like a tank (like most Boss products) and I am confident it will last a very long time.
The only issue I have with it is the volume sweep.
It seems like all the action happens in the first 20% near the heel.
There is a small dead spot in the heel down position to about 5%, then a quick jump in volume up to approx 10% (not smooth in the first little bit), followed by a steep sweep to nearly full volume all in the first 20-40% of the sweep.
From 40% to toe down, there is almost no change.
It feels much like a logarithmic curve.
I would prefer linear or exponential...
Because it is built so well, I will keep it and modify it.

I had always rated Boss pedals highly but this one, I'm afraid, really let me down. It is built like a tank...which is good, but there is one thing that you just cannot have in a Volume pedal and that is a noisy, scratchy pot, which rules it out for guitar swells...why I bought it in the first place! After a very small amount of use, less than two months, the right input developed an audible scratch and no amount of switch cleaner made any difference. Luckily I was using it in mono so I switched input/output to the left channel which now, some two years later, has begun to scratch too! I will not be replacing it with another expensive Boss pedal.