Before version 1.1.0.0,
ONYX can be used with a USB TAP or TELETAP / Analog tap.
Thereafter ONYX only works with the USB TAP!
The USB Tap has a soundcard for recording and uses the soundcard of
the PC for playback. The Teletap uses the soundcard of the PC for
recording and playback.
ALSO SEE: What is the requirements to run ONYX?
ALSO SEE: ONYX 1.0.0.3 [working with analog line recording]