I can hear one sound but not both

[357mag]

I recently picked an audio interface which is a Focusrite Scarlett 18i8 model which you can see here:

https://focusrite.com/en/usb-audio-i.../scarlett-18i8

I have my Line 6 POD X3 sitting right on top of it.

I took two cables and connected the left and right outputs on the back of the X3 into the inputs on the back of the Scarlett.

Today I have been trying to get both my live guitar and a Guitar Pro file to come through my headphones at the same time.

I have had no success with this.

I want to be able to hear two sounds at the same time in my headphones. My live guitar sound plus a backing track (or perhaps a Guitar Pro file). I currently am not using my recording software. I am just getting the Guitar Pro file coming through my headphones by using the Guitar Pro software.

I know the X3 acts as an interface and I can plug my guitar into the guitar input on the X3, and plug the headphones into the headphone input on the X3. And then go into Manage Audio Devices and choose the POD X3 as my audio device.

But can't I use the Scarlett as my audio interface and with that have both my live guitar sound plus a backing track coming through my headphones at the same time?

I don't know much about hooking all this stuff up. Maybe it can't be done?

I need some help here.

[357mag]

So far I have been only able to hear both sounds coming through my headphones if I use my POD as my audio device. If I plug my guitar into the guitar input on the POD and plug my headphones into the headphone jack on the POD also, then going into Manage Audio Devices and choosing the POD X3 as my device. I wanted to see if I could in effect run the POD through the Scarlett to record and practice with. But so far no luck with that.

[357mag]

It's like right now I have to wear two sets up headphones at the same time. I have one set plugged into the headphone jack of the POD, and the other set plugged into the headphone jack of the Scarlett.

 

But I can't wear two sets of headphones at the same time.

[silverhead]

This sounds like some setting needs to be adjusted in the Scarlett interface. The POD X3 works as expected when it is connected via usb and used as the interface so it’s not an issue with the X3. I’m not familiar with the Scarlett but my instinct says it should be able to send a mix of both the rear panel audio inputs and the usb audio input to the headphones output.  Consult the Scarlett documentation or it’s user group for info on how to do that.