Hello Sir,
Actually, rekordbox lighting engineers are not quite sure how you would like to use the RB-DMX1 with each of your lighting fixtures.
As you mentioned "uploading parameters every time", do you mean assigning your fixtures in the Fixture library screen?
There is no such features to upload any parameters in the rekordbox lighting.
Also, may I ask you if you already checked all the fixtures you have included in the rekordbox library?
If you have multiple fixtures, please check if they are in the library first.
Otherwise, you will not be able to use unlisted fixtures with rekordbox lighting.
As the first step, please read through the rekordbox lighting manual from the link below.
https://cdn.rekordbox.com/files/20211111064929/rekordbox6.6.0_lighting_operation_guide_EN.pdf?
_ga=2.222796888.295493326.1700783276-1737690633.1694751492
Also, you will be able to find all the lighting fixtures currently listed in the library from the link below.
Anyway, we believe you do not have to use so many RB-DMX1 devices when using lighting features because you can add fixtures to "Venue" in the Fixture Library screen.