Offizieller Kommentar
Please update your mixer firmware from the link below.
https://forums.pioneerdj.com/hc/en-us/community/posts/360056128711-Resolved-DJM-REC-recording-issue
Also, please download the new DJM-REC version from the App Store link below.
https://apps.apple.com/app/id1292535659
Thanks,
CRM, Pioneer DJ