I have a Squier SP-10 practice amp and a Behringer UMC202 HD audio interface. I am listening to a guitar piece in Trascribe, trying to learn it. I need to use headphones. I need to try to connect the headphone out to the usb audio interface input so I can listen to the amp and Transcribe on my PC through the audio interface at the same time. If I try to connect a guitar cable from the amp headphone output to the audio interface input and listen to the output from the headphone output on the audio interface there is very, very little volume. Is there some way to make the volume louder. I know that there is a connection because if I turn the volume to max on the amp and I can barely hear the sound from Transcribe on my PC through the audio interface headphone jack.