Did you plug your headphones in the front headphone jack? There are 3 knobs on the right: one to control the monitor volume, one for the headphones volume, and another labeled Mix. The mix knob adjusts where the sound will come from, either straight through the US-1641, or straight from the...
I have a Tascam US-1641 audio interface that I use to record on my Macbook with Logic. When I first set everything up I had an issue getting the correct drivers so I called Tascam customer service. After a long hold I was told to install the previous "large" update to the drivers (the jump from...