JJOX2XL Sends MMC even when SEND MMC is set to OFF

MPC 1000 / JJOS2XL ver. 3.50

I'm looking to send MIDI Clock out (to sync up tempos for my synth arpeggiators, synced LFOs, etc.)

But I don't want to send MMC (or else all of my synths with sequencers start playing simultaneously).

In the MIDI Sync Window, I set:

Sync out: ON (Master)
OUT A: Clock
OUT B: Clock
Frame Rate: 25
Send MMC: OFF

But I checked the MIDI output using MIDI-OX -- the MPC transmits MMC START/STOP signals even when "Send MMC" is OFF.

Is this a bug? Or am I missing a setting somewhere?

Thanks