Good video, but:
You can adjust individual DSP's using this method, but you can only save the last adjusted DSP (last one assigned to the voice) in a registration.
Tyros 5 and prior keyboards only had the DSP MSB, LSB and on/off status saved with each voice. After T5, the voice DSP section was expanded to include detailed settings that could be adjusted. There is one DSP detail section for each voice in the registration file. With the Genos, there are now 28 DSP insertion sections, but these sections only contain the DSP's MSB, LSB and either the assigned voice number or Off.
Since the assignments you made were stored in the 28 insert sections, it would appear when you select the registration button that all the adjustments you made were saved, but sorry only the last one is actually retained, all the others will revert to default values. It appears that any adjustments made to individual DSP's will remain in effect until replaced, by selecting another registration button.
It seems that the design of the Genos system allowed you to tailor the primary DSP assigned to a voice and save those changes in a registration, but any further layering (though also saved in the registration) would use the default values for the additional DSPs.
Some have indicated that this is a bug, I think it's more of an evolution.
Cheers,
Murray