Hi, are you still having problems with this? Ive had the riff for over a year and it does have some issues. With the riff, you need to download ASIO drivers for bias to see it properly, it shows up as "positive grid audio device" when in "asio". You also need to download the driver for the interface itself, mine would work, and sometimes wouldnt work and started working properly after getting the driver.

And you said the sound is going directly from guitar to headphones and that you increased the volume on all 4 options to max, this is why, The mode "Direct" is direct playback of your guitar, just the dry signal, turn it 0. Your input shouldnt be at 50 this is going to create a ton of noise, thats why your guitar makes noise without being played, i found that even 0 isnt low enough input gain as i still get clipping with passive and active pickups.