Its pretty simple. You need to use 2 of the pedal jacks on the back of the Ax8; these jacks only support one switch each. I use the FS-7 (in non-latching mode) which is nice and compact and great for this application, and it works without power in non latching mode. I have it plugged into pedal jacks 3 and 4. Once connected up, just go to set up and select the I/O menu. Select the CTRL page. Scroll down until you find 'out 1 vol incr' and select pedal 3, (or whichever pedal jack you are using). Scroll down to 'out 1 vol decr' and select pedal 4. Then, and this is important, scroll back up the list to 'external 3', and set it to none, and then do the same with 'external 4'.
That's it really. Be aware though that if you use this feature whilst playing a note / chord, you will hear a drop out. Also, this function automatically saves, so if you are using a scene, and have say switched in a drive pedal, if you then use the vol increment switch, it will save your scene with the drive on.
........And the mother
