High impedance is correct for an analog volume pedal with guitar.
A volume pedal is generally not a good choice to use as an expression pedal as expression pedals have linear taper pots but volume pedals have logarithmic (audio) taper pots. You would need to rewire the output for a TRS (stereo) cable to make it work. When using a modified volume pedal as an expression pedal you tend to end up with all the adjustment available only in a very small area of the travel then everything drops off a cliff.
Some volume pedals (such as FV500) have two pots and separate outs to allow them to be used in either situation but it doesn’t look like the FV30 is one of them.
Yes some volume pedals handle expression perfectly because they were designed to. I have both the Boss FV-500H & FV-500L. They both have dedicated exp. jacks. But the 30 series is not capable.
The 500 series prices aren't kind, but I found one at a goodwill for $35 and the other from Japan for $30 just days apart. But regardless, these have to be the most rugged and robust pedals I've ever stepped on. Even more solid than good old Crybaby housings. They are incredibly designed so I can see their MSRP's being fair. But if you can grab one used, jump on it.
Yes some volume pedals handle expression perfectly because they were designed to. I have both the Boss FV-500H & FV-500L. They both have dedicated exp. jacks. But the 30 series is not capable.
The 500 series prices aren't kind, but I found one at a goodwill for $35 and the other from Japan for $30 just days apart. But regardless, these have to be the most rugged and robust pedals I've ever stepped on. Even more solid than good old Crybaby housings. They are incredibly designed so I can see their MSRP's being fair. But if you can grab one used, jump on it.
Many people love the FV500 including Bert Meulendijk. I bought one on his recommendation and agree they are unbelievably solid. However, I no longer use it as I hate the dead spot at each end of the travel which can’t be dialled out. They are also enormous and weigh more than a small planet 🤣
Spantik7000 I can highly recommend themZoom FP02M as a great expression pedal at a reasonable price.
Many people love the FV500 including Bert Meulendijk. I bought one on his recommendation and agree they are unbelievably solid. However, I no longer use it as I hate the dead spot at each end of the travel which can’t be dialed out. They are also enormous and weigh more than a small planet 🤣
I wonder why you have dead-spots? Yes the mass of these pedals can create their own gravity fields. 
I wonder why you have dead-spots? Yes the mass of these pedals can create their own gravity fields.
The dead spots are there by design apparently. The tread moves a little before the pot kicks in. I tried to adjust the pot position etc but nothing works. The only way to fox it is to put some sort of physical stop (like a bit of rubber or something) under toe and heel.
The dead spots are there by design apparently. The tread moves a little before the pot kicks in. I tried to adjust the pot position etc but nothing works. The only way to fox it is to put some sort of physical stop (like a bit of rubber or something) under toe and heel.
I don't have dead-zones. I just opened one up to look at the mechanism and the motion of the pot is 1:1 with the treadle. 
I don't have dead-zones. I just opened one up to look at the mechanism and the motion of the pot is 1:1 with the treadle.
That’s interesting to hear. The dead zones are part of the design and are well reported by many users. Even C Kemper mentioned this in one of the posts on this forum. It crops up on forums for other devices too including the Fractal forum. In my case I know they exist from personal experience but it seems I am not alone. I wonder if you just got lucky or if yours were modified before you bought them.
That’s interesting to hear. The dead zones are part of the design and are well reported by many users. Even C Kemper mentioned this in one of the posts on this forum. It crops up on forums for other devices too including the Fractal forum. In my case I know they exist from personal experience but it seems I am not alone. I wonder if you just got lucky or if yours were modified before you bought them.
Really strange. It doesn't seem modified at all. Could it be that the rubber bits under the toe and heel are worn down on yours? Or the pots need some contact cleaner? I'm looking up some of the reports you mentioned. The only thing I saw different in others' pictures was the appearance of the pot itself. Theirs look very normal and generic dual pots. Mine looks more like a rotary switch. It's housed in a black finish. Maybe Boss changed them at some point? What the heck would be the purpose of this intended design? So strange...
Very strange indeed.
