Clock IN from Volca Sync

[gopilot]

I've been trying to get the NDLR to accept external clock from a volca drum using the Sync Out to the NDLR Clock IN. 
I've set the NDLR Clock In to "ClkIn CV" yet the NDLR isn't affected by the volca's Tempo. Is it that the Sync rate isn't really CV but rather a simple square pulse?
My big question: is there a way to get Clock In from a volca?