I recently bought a Boss FV-500L to use with my Line M13, i've chosen the FV-500L based on reviews from this forum, it's listed as a compatible expression pedal for the M13. I seem to have no luck on making it work, and i've tried almost everything, even tried a TRS Stereo to Dual mono cable with wired tip, and still doesn't work. With a normal patch cable or with the TRS cable it only seems to work for 1 or 2 second and then it stops sending information.
It's better f i explain it with a video, so i'll post it below.
Thanks in advance for your help