Ah, ok. Could also be CD music playback, or just Windows being weird.
Anyway, one piece of advice: I’d suggest you set mixer rate and sblaster oplrate to 22050, or even 44100. There’s a noticeable drop in audio quality especially between 22050 and 16000, and it has zero impact on performance. Really, absolute zero. On the S7 edge Exynos, you can also go for 44100 without seeing a difference. The device is just too powerful to be struggling with a bit of audio emulation. 😉