When using dax you are presented with several choices. which is the correct one to use? wdm-ks mme d

These are different audio APIs supported by Windows. They have different characteristics. MME uses the oldest Windows audio API which does not offer good play/record latency. DirectX improves this, but still imposes a penalty of 10s of milliseconds due to the system mixing of streams from multiple applications. WDM-KS avoids the mixing penalty of DirectX, and has very good latency characteristics; better than DIrectX. In general, if you can get WDM-KS to work with your third-party audio application, then you should use it as Mack has indicated. Otherwise try DirectX next and MME last.