I use Acid Pro 6. When recording with my MIDI keyboard I have no problems. I can hear everything I'm doing. Yet, when I record vocals (I use a Behringer UCA-202 USB interface) I can't hear anything. I can SEE that the system is recording because of the meters and waveforms being shown. This is the question: the UCA-202 has an output of 2 RCA plugs that aren't being used. Could I send this output to the open MIC jack on my Turtle Beach Riviera 5.1 surround sound card?