SL PRO 9 Separation of Drum parts?

While watching the SpectraLayers 9 World Premiere YouTube video, at SpectraLayers 9 World Premiere - YouTube, Mike is showing that he has separated the stems of the Snare, Toms & Hi-hat.
How did he do that?

These are pre-existing tracks from a recording session with multiple mics. He’s not showing how to separate the tracks, but how to de-bleed them.

Thank you for responding.
I get that but I don’t get how the individual tracks got combined to make the 3 layers. They each appear on the right in the display pane.

Okay, I figured it out.
For others that may need it:

NOTE: These instructions include How To remove BASS bleed from a VOCAL Track:

Select one track. ( Or, a section of the track. )

Render the Track/ Section.

Double-click on the Rendered track to open the Lower edit Window.

Launch SpectraLayers: Cubase Menu bar/ Audio/ Extensions/ SpectraLayers.

Next, Select another track. ( Or, matching section of the track. )

Render the Track/ Section.

Double-click on the track to open the Lower edit Window.

Launch SpectraLayers: Cubase Menu bar/ Audio/ Extensions/ SpectraLayers.

SOLO & Select the Layer ( on the Right) that is to be the Target. ( The Vocal track.)

SOLO that same Vocal track in Cubase. ( No other tracks should be Soloed)

On the SpectraLayers Menu bar/ Process/ De-Bleed. De-Bleed window appears.

The Source will be the Bass Layer. Select ‘Reduce Bleed’.

Press ‘Review’ to adjust the reduction ratio if needed.

Once satisfied, Press Apply.

Render the modified Vocal Track/ Section

Move the rendered Track/ Section back to the original Track/ Section location.