You can resample to 8kHz with WdlResamlingSampleProvider, MediaFoundationResampler or WaveformatconversionStream.
I´d prefer WDL as it is independent from components installed on you system.
For 20 ms buffer playback set latency of your waveout device accordingly.
I´d prefer WDL as it is independent from components installed on you system.
For 20 ms buffer playback set latency of your waveout device accordingly.