Go USB out from your helix and into your computer. Then use headphones from the helix headphone port. You'll be able to hear computer audio and guitar signal. Use the output at the end of your helix chain and the volume from your the video to find a good mix. If that's too confusing I can make a video for you. It's really not as complicated as it sounds
How are you playing the track and hearing both the track and your guitar when you play/practice like this?
Go USB out from your helix and into your computer. Then use headphones from the helix headphone port. You'll be able to hear computer audio and guitar signal. Use the output at the end of your helix chain and the volume from your the video to find a good mix. If that's too confusing I can make a video for you. It's really not as complicated as it sounds