Does the Synhouse MIDIJACK provide MIDI out as well so I can use my Pro-One as a MIDI master controller?
No, fortunately. A Pro-One? You couldn’t find a worse master controller keyboard if you tried. It is incapable of controlling itself reliably, so there is no point in using MIDI to share that misfortune with other synths. There were two revisions of the Pro-One keyboard mechanism. There was one that was horribly unreliable and there was another one that was worse.