Trying to use a BMX to arpeggio trigger a MonoPoly

Hello!

I just got the BMX and it seems I should be able to use a connection from its SYNC OUT socket to the MonoPoly's ARPEGGIO socket in order to time sync the two.

Maybe I'm not understanding what's possible, or I'm doing something wrong, but I thought the MonoPoly's arpeggiator would follow the tempo set on the BMX, but it isn't.

The BMX's sync is set to INT.

Have I misunderstood what this is supposed to do, or have I possibly just used the wrong cable? The BMX manual says TRS in one place and TS in another!

Have I missed a setting on the MonoPoly, perhaps?

Thanks.