Dan,
I’m having the same issue and haven’t received a solution or workaround for use on my 2 channel DJM-S9. I’m at the point that I believe the preview function is geared toward users who have more than 2 channels I.e., (4 channel mixers).
It’s a useful feature that I would gladly love to use with my setup, but since I’m a 2 channel guy (mixer/turntables) this feature was created to utilize an unused audio channel which the djm s9 don’t have readily available. There are workarounds, however, to go in and out of Rekordbox’s preferences to change the preview channel to the available channel every time you want to preview a track would be counter intuitive and convoluted.
i guess I’ll stick to loading the track I’m previewing into actual deck and cue it up that way.
TJ
