u/Fearless-Witness7726

I just got the sidekick (EP-136) from Teenage Engineering and I want to use it as a mixer for the iPhone rekordbox app.
I set sidekick‘s USB IN settings to Multi.
Still both tracks in rekordbox are on channel 1.
in rekordbox iPhone app I was not able to find something to route.
Am I missing something? Do I need a subscription?
Do I need another app? If yes, which one are you using?
Love Arno

EDIT:
On rekordbox Mac app it is working fine, since I can set mixer mode to external in rekordbox.