Has anyone had success in connecting the Sonic Port to studio monitors for sound output? I can hear fine through headphones. I have KRK Rokit 5's. They have a volume knob on the back and if I crank it I still barely hear anything. The product description implies this should be possible: "You can even connect powered studio monitors via the 1/4â€ mono/stereo guitar/line-level output." Has anyone had success trying this and how?