Sorry for the late reply. Finally got around to looking into this. The Korg docs are no help... the secret sauce for sending clock to the SQ-1 is to use the 2nd virtual MIDI input. It's called MIDIOUT2(SQ1) in MIDI OX.
The bad news is, MRCC USB host only has 1 virtual MIDI port output, so there's no way to address the 2nd virtual MIDI port on the SQ-1. In my own rig, I worked around this by using the SQ-1 Sync In, as I'm typically using The NDLR as a clock source.
The bad news is, MRCC USB host only has 1 virtual MIDI port output, so there's no way to address the 2nd virtual MIDI port on the SQ-1. In my own rig, I worked around this by using the SQ-1 Sync In, as I'm typically using The NDLR as a clock source.