It just processes at the sampling rate that I manually set. It doesn't say wasapi in the Amazon description nor autoswitch in fact. However, neither driver re-sets the bit rate based on the source material automatically. Leaving either driver open on the PC desktop makes it much easier to change settings on the fly.

Windows confirms that for either driver, changing the setting there changes the setting in Windows as well. Either allows me to set sampling rate, Hz bit rate. For my Hidizs mobile DAC/AMP, I have a TempoTec ASIO driver. For my JDS labs DAC/AMP, the XMOS ASIO driver is supplied. However, I found that I can use ASIO with the firmware drivers supplied with my hardware. which isn't bad despite the downsampling or whatever, but not ideal.

Hence, having to go through the windows menus to modify the bitrate all the time. Can you hear it? My experience is often it is very subtle, but once in a while I will hear something that just doesn't sound right at all. If you just set Wndows to default to a high bit rate in playback, as I understand it, the playback involves upsampling or something similar to modify the signal if the source bit rate doesn't match the playback bit rate. The problem is that in order to match the bitrate to source material, one has to go through layers of Windows Settings menus to set the bit rate for each song. I use Amazon HD but have been frustrated that the service has no API to use ASIO.

Amazon music player device