Multitracking with problems

Windows 10 home laptop Lenovo ideapad y700 Alesis MultiMix 4 USB FX Audacity 3.2.1. Using multitracking, when I add a track the previous track is also recorded, but I just have to hear it, not record it. I’ve tried all possible combinations. Thanks for help.
Bertulis

This includes setting the Output device to your laptop’s headphones?