Hello Scott,
No functionality has been added to Hauptwerk since this topic was first posted, so the same still applies.
For any given organ (i.e. on a per-organ basis), you can map any given MIDI expression pedal to one or more virtual expression pedals/sliders/knobs but it will then always operate the virtual control(s) that you've mapped it to (in parallel, if mapping it to multiple virtual controls).
I see that the Hereford XL sample set has a 'float swell pedal' virtual expression pedal:
https://www.lavenderaudio.co.uk/organs/ ... page7.htmlhttps://www.lavenderaudio.co.uk/herefor ... rtrait.jpg... which implements functionality within the organ definition specifically for switching between the sample set's built-in Choir, Swell, Solo and Crescendo virtual expression functions. Hence you could presumably use that to allow your MIDI expression pedal to switch in real-time between those four things. However, you can't natively/directly also/instead switch it in real-time between any or all of those three things and Hauptwerk's Master Crescendo or Master Volume controls (which are entirely separate from the functionality provided within the sample set).
You could conceivably map your MIDI expression pedal *both* to the Hereford XL's 'float swell pedal' *and* to Hauptwerk's Master Crescendo, but the MIDI pedal would then always control both sets of functionality in parallel. You could perhaps configure the two in parallel and then also configure one of the four banks of Hauptwerk's Master Crescendos to do nothing (turn no stops on), so as effectively to enable/disable it on the fly (by selecting which of the four banks you were using at any given point in time), which would give effectively give you a means (albeit rather a fiddly one) to switch your MIDI pedal between the sample set's Choir, Swell, Solo and Crescendo virtual expression functions and Hauptwerk's Master Crescendo.
I.e. which of the four Hauptwerk Master Crescendo banks was current would determine whether Hauptwerk's Master Crescendo was having any effect, and which of the Hereford XL's "
FLOAT SW PED TO ..." couplers was on would determine whether any of the sample set's virtual expression functions were also being controlled.
Best regards, Martin.
Hauptwerk software designer/developer, Milan Digital Audio.