Expression pedals, or as some call them volume pedals are an indispensable piece of kit for every performing keyboard or guitar player. But finding the right one that performs excellently with your particular combination of equipment and has no dead spots at the top or bottom of travel and offers a linear response is a lot harder than you might think.
Recently one of my favourite keyboard player forums hosted an incredibly useful thread on this subject. Yes, it is keyboard player centric (sorry guitar players) but there is still a lot of useful generic information for all and there is even a google doc chart you can download offering a wealth of data on the matter.
The best part is the information is actual reports from people using this stuff in the field rather the click bait, pseudo review “top ten” style stuff that often appears in google search results.