Hello... it is a little quiet, but noise might be something else with your wiring, as mine is running straight into Audient Evo 16 line-in, with +10 DB gain boost and volume on OB-X8 maxed, resulting between -6 and -12 DB on the faders for the first patch "It's an Oberheim!".
At first, I did wonder how that would go, but there is no audible noise floor, hum, etc. Nothing even appears on a zoomed-in meter. Just super clean output, more so than some of my other hardware which can get to -60 DB or more on the meters for noise on the same interface.
Assuming you tried unplugging the USB port and re-check the meter?