although a volume pedal will work with a Y cable it isn’t a great solution because Volume pedals have an audio (logarithmic) taper pot but the the expression input is expecting to see a linesr taper so the sweep is usually very compressed with very little effect for most of the travel then a huge effect in a very short portion of the sweep.
rather than mess around with trying to find the correct Y cables you might be better just buying a cheap expression pedal. It doesn’t need to be anything expensive like the Mission or Dunlop pedals. i bought a used Zoom pedal for £11 and it works just fine - much better than using a Y cable with my volume pedals.
Y cable or insert cable?
I might as well keep the Mission, although Im not that impressed with it. Works well but doesnt feel that great.
Thanks guys.