[junkgear]

Well, direct monitor just takes the input signal and internally routes it to an output in the audio interface, so PTF is not in the equation there.

You mention ASIO4All, so make sure your inputs and outputs are assigned properly in that driver.

WDM is different than ASIO, so the fact that it works in Windows (WDM) doesn’t mean that it will work the same in PTF. PTF uses the ASIO driver, so that’s where you need to make sure everything is configured properly.

Also make sure the other tracks, that you don’t hear, are routed to the proper outputs of your interface.

If nothing works, post some screenshots of your playback engine settings, input/output settings and your session, mainly the input and output assignments for the tracks.