Pv6 usb issues

I’m using a PV6usb. Currently, when i press tape/usb to ctrl/hp and try to record, i can hear the track, but not my vocals through my headphones. When i use tape/usb to mix instead, i can hear the track and my vocals, but audacity records the track a second time on top of my vocals causing the audio to spike. Am i doing something wrong? Is there a quick fix for this in audacity?

I think for linux im using 16.04 and for audacity 2.3.3

Plug your headphones into the mixer.
In the Audacity “Transport menu > Transport options”, ensure that “Software playthrough” is OFF (not selected).