I'm new to using vMix so I'm hoping to find a solution to my problem

I am using a PC to run vMix

For the sound into the computer and the main sound into vMix I am using a Rodecaster Pro mixer/recorder
the Rodecaster is connected to the PC using USB. I also use the Rodecaster to monitor the sound of the production.

I use a MXL 990 mix pluged into the Rodecaster for my voice

For now I am using a Logitech C610 webcam as my main camera, I select none for audio

In vMix for sound I select the Audio input as the Rodecaster Pro and mute the headphones

In vmix under Audio Outputs Master Output and Headphones are selected as Default Windows Playback Device

So to the problem

When I initiate a vMix Video Call, I get perfect sound to the person, the video from the person is crystal clear, also my video
and sound to them is also very clear with no echo or feedback.

The problem is, although the caller IS using a headset, they are hearing an echo, not feedback but a echo of their voice.

I have looked, read and watched various tutorials but I can't find how to fix this problem.

I thankyou in advance for your help.

Cheers
Brian

What Can I Say!!! You are a lifesaver a genius!! Thankyou so much for your help.

Everything now works perfectly. I found the setting for mix minus in the Rodcaster menus, turned it on and all is good.

Again thankyou