Abyss LFO, not sine wave?

Hello all,

I recently finished building the abyss vibe. When I take a look at how the LED pulses, it seems like it's more of a square wave. It certainly doesn't ramp up and ramp down smoothly as though following a sine wave. From my understanding, the LFO should be producing a sine wave. With the LED not smoothly getting brighter or darker the effect is a little choppier than other univibes I have built.

Is this the normal behavior for the LED in the abyss pedal?
 
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