Thank You for Your question. It's sample bit depth, not sample rate, You are talking about, right? "Sync Sample Rate" feature does what it says - tries to match sample rate. Regarding bit depth - Yes, correct, You can select preferred one in macOS Audio Midi Setup.
Thank you for reply.
When check the sync function and playback 16bit and 24bit sources, the sampling rate may be converted as it is 16 bit. In that case, set it with Mac Audio. yes. understood. Thank you.
16 and 24 are sample bit depth (measured in bits), 192/88.2/48/44.1 is a sample rate which is measured in kHz. VOX controls Sample Rate of the output, not sample bit depth, when Sync Sample Rate Option is On. It's best to manually set bit depth to maximum possible for device In Audio MIDI Setup.