Thank you for the info. That's too complicated for the simples DSD up sampling task. The trivial convolution is very relevant there.
Merge https://github.com/MusicPlayerDaemon/MPD
And what is "Bits" value under Preferences->Playback->Output->Devices?
This DAC uses XMOS ASIO driver. Have you tried Default: ... [exclusive] 32 bits instead of ASIO: ... ?
What output device do you use?
Thanks, Merry Christmas too! Red colour means CPU overload. It doesn't change audio stream. No, I didn't test in different modes.
I've just tested that both 2.0.2 and 2.0.3 produce the same DSD64 stream out of PCM44100 source at 0 dB volume. If, on your system, it is not so it is very strange.
What Foobar version do you use?