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FLyingOrganist wrote: would like to get Hauptwerk to distribute everything across the four speakers, possibly with a c/c# split.
If you just want all of your speakers to be in a single group (i.e. used for all ranks), then please see the 'Example 5: simple multi-channel audio with 8 (or more) speakers all configured as stereo pairs all in a single group, optionally plus a sub-woofer, optionally with an additional pair of ‘rear’ speakers for surround-sound, optionally with an additional pair of speakers as an ‘aux reverb mix’ with added reverb (which can be bypassed, or its wetness adjusted, on a per-organ basis)' example in the main Hauptwerk user guide (pages 192-195 in the current v5.0.0 version).