Hello Jan,
Thanks for the continued interest in Hauptwerk.
I've moved your topic moved here, since this section of the forum covers reverberation effects, surround-sound and multi-channel audio.
If you haven't already done so, try searching the forum (using the forum's 'Search' link, which is directly above the forum screen area, rather than the Search box at the very top-right of the page, which instead searches the main Hauptwerk website) for 'Lexicon' which finds lots of topics discussing the Lexicon units that people are using.
Also have a browse through this 'Amplification' section of the forum (
http://forum.hauptwerk.com/viewforum.php?f=17 ) for other ideas in general. There's a certain amount of inevitable overlap with the 'Audio / MIDI interfacing' section of the forum (
http://forum.hauptwerk.com/viewforum.php?f=3 ).
We have a tutorial here that covers how to use Reaper to apply reverb effects to Hauptwerk's output:
https://www.hauptwerk.com/news/tutorials-sequencing/2015/06/08/hauptwerk-with-reaper/ . (See also the '
Using an AU/VST host to apply real-time reverb' section in the main Hauptwerk user guide -- pages 183-184 in the current v4.2.1 version.)
Many current/recent Hauptwerk sample sets are 'surround', whereby they include sets of stereo samples recorded from several different microphone positions/perspectives (e.g. close to the organ, and further away). You can choose to load some or all of those perspectives in Hauptwerk, and to route them to different sets of speakers.
Best regards, Martin.
Hauptwerk software designer/developer, Milan Digital Audio.