No the VP jnr is a Volume Pedal too. Of you want to control features such as Wah, Pitch and Morph then you need an Expression Pedal. Expression pedals normally have only one input on them which is wired for a TRS (stereo cable). It is possible to make a special dual TS to TRS cable as a workaround to use most volume pedals as an expression pedal but this is never a great solution and I definitely wouldn’t waste any money on a high quality volume pedal if I was going to use this fudge.
The next difference is that volume pedals have Logarithmic (audio) taper pots. These have most of the effect concentrated in the first portion of the travel. As the pedal moves towards the toe the pedal becomes progressively less sensitive. This is what we need for volume as our ears don’t hear in a linear fashion. However, it makes them virtually useless for controlling things like Wah, Pitch and Morphing controls like delay mix etc. Although the Kemper has a volume pedal function it is a software emulation. The Kemper needs to receive a linear input from an Expression Pedal which it uses to compute a logarithmic taper. The Kemper volume pedal is all software - no audio signal goes through the pedal at all. This is why expensive pedals don’t usually provide any noticeable difference in sound. However, in some cases the build quality and physical feel may be worth paying for if you gig with them a lot.
There are a few pedals which can be used as either a volume or expression pedal. They typically have two separate pots inside with both attached to the pedal. You then choose which output to connect to depending on which function you need. Boss FV500 is one and Dunlop DVP series is another (they do a mini pedal if that is important). It maybe that Tapestry are doing the same thing and simply using the DIP switching for routing instead of multiple outputs (this would certainly save space and allow the pedal to made as small as possible. However, the literature only seems to mention a single pot so I would want confirmation that the taper is truly linear with a resistance around 10k -25k rather than the typical 250k range for volume pedals.
You really don’t need to spend much money to get a good expression pedal as they are literally nothing more than a single pot (c £5 retail but pennies in bulk to a manufacturer) and a 1/4” jack socket (less the £5 retail but again pennies in bulk) inside a casing. You are paying for the casing.
Hope that helps.