I notice a weird (unexpected) result in some features of PGMusic apps, and this is just my observation from personal experience, on my systems and those I've observed.

For the main use of RB/PT the driver selection (in Prefs) is critical.
Then an occasional feature uses the default system setting regardless of the above RB/PT selections.
Some preview items, some metronome items, etc, seem to use whatever Windows is using even if RB/PT is set to use a different configuration.

For me, opening the Windows mixer and seeing exactly where the sound is being routed sometimes helps decipher it. Other times the sound card mixer itself finds it quicker (they can be very different views).

Something to investigate.

I do not work here, but the benefits are still awesome
Make your sound your own!