Open V-Metal, on global controller page at the top click the little "options" dropdown in the corner, select "MIDI CC#" from the list, from there you can change the various controllers used by V-Metal, just doubleclick on the numbers and type in whatever controller you want.
Try setting "gls down mode" to to 1 and move your pitch wheel, change back to the main options page and you should see the "glis down" value change between "fast/mid/slow"
btw Here's a manual link for the TS12 if you don't have one:
http://www.ts12.net/ts12-ev-downloads.html