Hymn voicing

Stig's advice is always excellent.

I'd also add that OTQ is quite muddy by default for use within a church as the reverb gets quite intense.  Depending on the size of the space, you may wish to significantly dial down the reverb of any of the default organs (most of the OTQ organs appear to be designed to match an audience listening position--so the reverb includes the resonance of the organ loft, the early reflections/area around the case, and then the long tail of the rest of the space--all you need is enough resonance for the organ loft and maybe just a little extra if the church you're in is on the smaller side).

There are also ways to increase "clarity" and "presence" by altering EQ parameters, the stereo positioning and other settings of each division, and individual stop settings like brightness.

It's a little tricky to guess what exactly the space needs without hearing it or knowing more specifics of your system/setup (e.g. speaker placement/design and room size).

I wonder if Modartt will release presets that are better designed for better out-of-the-box use in medium to large churches--or maybe even microphone placement presets that work independently of the stock presets like in PTQ--or something similar that would allow easy swapping between the stoplists of different organs while maintaining more consistent general settings.  This seems to come up more and more regularly.

I also find that changing registration throughout a hymn does more for OTQ realism than "parking" on a single stop set for the duration; that does more than which stops are being used in my experience.  Either using the crescendo shoe or the combination system does wonders...