Recording

Hello, I was able to record internally via USB from my Pioneer DDJ-SX2 DJ controller. I upgraded and got the DDJ-1000SRT and Audacity recognizes it but no recording signal is captuteed. I tried soundflower and all…no signal. I am able to get a record signal using a RCA to 3.5mm cable into the line input on my Macbook Pro but I want the recording digital…HELP???

Sierra
2.3.3

Can you record with Serato?