Using DDJ-RX/Rekordbox with Scarlett 2i2

I just got my DDJ-RX in and I'm having some issues with getting playback in my speakers.

I'm using a Scarlett 2i2 audio interface, I have it configured as my default audio device, and I have it wired to my computer speakers using a Hosa CMP-159 3.5 mm TRS to Dual 1/4 inch TS Stereo Breakout Cable. All normal audio outputs are working fine (Spotify, Youtube, etc), but I haven't had any luck getting sound to correctly output from Rekordbox/controller.

I've activated PC MASTER OUT in Rekordbox so all sound should be routed through the USB rather than using the controller master outputs, and I've switched the master output in Preferences > Audio > Output Channels > Master Output to "MASTER + Focusrite USB (Focusrite USB Audio)", but still no luck.

At this point I've tried messing around with other output channels & settings to no avail, and I can't find anything online that's been any use to this point.

Any tips/recommendations?

EDIT: I also tried taking my Scarlett 2i2 out of the equation by just routing all system audio through my built in audio card and to my computer speakers, but that didn't help either.