sub 37 slave to maschine studio

Complete newbie here, i’m trying hard to teach myself slowly how this all works.

First up, I got a step sequence going on the sub37 and I want to sync it to the tempo of maschine studio.

midi out of maschine into midi in of sub37.

sub 37 line mono out into my mixer, mixer into soundcard

Enabled send midi clock in maschine.

press play on maschine

run the pattern on the sub 37 yet when I hit sync on the sub the sequence stops?