Any passive volume pedal is going to suck tone, regardless of the tuner out being used or not.
They do this 2 ways. 1) resistance to ground peals the high freqs. off.
2) The volume pot never goes to full 10. It stops about about 8, because you can't get a full rotation in rock of a pedal. You can calibrate an EB, for example, go to 10 BUT the tuner out becomes pointless becuase it won't go to 0.
The Visual Volume has a high quality, EQ flat buffer. This ELIMINATES "tone sucking" in the volume pedal and EVERYTHING that comes after it. Secondly, the volume pot is a custom pot that shifts the sweep into the area where a treadal can roll it from full off to full on.
Some will say "I don't want to buffer". They're crazy BUT you can turn it off. There are two switches internally, one for each output. Move them to passive. The LEDS will still funtion but you will notice the tone will slightly darken. This is "resitance to ground"'s effect on your signal.
The VV10 also as upto 20 db of clean boost built in. Inside there are 2 pots, one for each channel, set it to the amount of boost you want and go. I don't use the boost feature.
Ever try to change the pot on an EB? It's hard and the pot is expensive. I have several friends that are EB endorsers that got tired of fixing them. They use the VV because you can change the pot in about 10 min. 5 screws (includeing 4 for the bottom), a bolt and 2 CAT5 cables.
Volume Swells. Google Bret Mason. He is the first call session guitar player in Nashville. He make s a living on swells. He uses the VV.
Ever heard of Steve Via? He uses the VV?
Ever watch Conan Obrien? Jimmy, he's band leader, uses the VV.
Lastly, Bob Weil, who invented the Visual Volume, did so because he HATED his Ernie Ball.
The LED's? Sound guys LOVE this because YOU know exactly where you're normal volume after you've boosted the volume for a solo or a swell.
So buy one of the others and regret it later or by the VV10 and never buy another.