Latency

Hi, I used to use ntrack and after 5 yrs Logic pro , went back to ntrack. When I am singing while recording, there is latency in the output. Not the music but my voice. When I put apogee duet from stereo to mono, I can still hear the music and my voice without a latency, but, than the voice is not recorded…
does anyone recognize this and knows how to solve?

Does anyone know the basic settings for apogee and the bassic settings for ntrack if you want to record while singing and can hear your voice plus the previous recorded audiotracks at the same time without an echo or delay on the voice. Maybe someone uses ntrack this way with an imac and apogee? Screenshot from basic setting would be enough to help :)