diff --git a/CSCore/CoreAudioAPI/PolicyConfig.cs b/CSCore/CoreAudioAPI/PolicyConfig.cs
new file mode 100644
index 00000000..25dba0d3
--- /dev/null
+++ b/CSCore/CoreAudioAPI/PolicyConfig.cs
@@ -0,0 +1,347 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace CSCore.CoreAudioAPI
+{
+    internal static class ComInterfaceIds
+    {
+        internal const string UNKNOWN_IID = "00000000-0000-0000-C000-000000000046";
+
+        internal const string POLICY_CONFIG_CID = "870AF99C-171D-4F9E-AF0D-E63DF40C2BC9";
+
+        internal const string POLICY_CONFIG_VISTA_IID = "568B9108-44BF-40B4-9006-86AFE5B5A620";
+        internal const string POLICY_CONFIG_7_IID = "F8679F50-850A-41CF-9C72-430F290290C8";
+        internal const string POLICY_CONFIG_X_IID = "CA286FC3-91FD-42C3-8E9B-CAAFA66242E3";
+        internal const string POLICY_CONFIG_X_RS_IID = "00632A31-4D49-4167-8AE1-27F82CE135B1";
+        internal const string POLICY_CONFIG_X_RS2_IID = "098FF37B-1062-4B1A-AD73-2A2D530FEAB6";
+        internal const string POLICY_CONFIG_X_RS3_IID = "5731289F-3E89-4209-86BE-6599A8E05E67";
+    }
+
+    [ComImport, Guid(ComInterfaceIds.POLICY_CONFIG_VISTA_IID),
+    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    internal interface IPolicyConfig
+    {
+        [PreserveSig]
+        int GetMixFormat(string pszDeviceName, IntPtr ppFormat);
+
+        [PreserveSig]
+        int GetDeviceFormat(string pszDeviceName, bool bDefault, IntPtr ppFormat);
+
+        [PreserveSig]
+        int ResetDeviceFormat(string pszDeviceName);
+
+        [PreserveSig]
+        int SetDeviceFormat(string pszDeviceName, IntPtr pEndpointFormat, IntPtr MixFormat);
+
+        [PreserveSig]
+        int GetProcessingPeriod(string pszDeviceName, bool bDefault, IntPtr pmftDefaultPeriod, IntPtr pmftMinimumPeriod);
+
+        [PreserveSig]
+        int SetProcessingPeriod(string pszDeviceName, IntPtr pmftPeriod);
+
+        [PreserveSig]
+        int GetShareMode(string pszDeviceName, IntPtr pMode);
+
+        [PreserveSig]
+        int SetShareMode(string pszDeviceName, IntPtr mode);
+
+        [PreserveSig]
+        int GetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetDefaultEndpoint(string pszDeviceName, Role role);
+
+        [PreserveSig]
+        int SetEndpointVisibility(string pszDeviceName, bool bVisible);
+    }
+
+    [ComImport, Guid(ComInterfaceIds.POLICY_CONFIG_7_IID),
+    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    internal interface IPolicyConfig1
+    {
+        [PreserveSig]
+        int GetMixFormat(string pszDeviceName, IntPtr ppFormat);
+
+        [PreserveSig]
+        int GetDeviceFormat(string pszDeviceName, bool bDefault, IntPtr ppFormat);
+
+        [PreserveSig]
+        int ResetDeviceFormat(string pszDeviceName);
+
+        [PreserveSig]
+        int SetDeviceFormat(string pszDeviceName, IntPtr pEndpointFormat, IntPtr MixFormat);
+
+        [PreserveSig]
+        int GetProcessingPeriod(string pszDeviceName, bool bDefault, IntPtr pmftDefaultPeriod, IntPtr pmftMinimumPeriod);
+
+        [PreserveSig]
+        int SetProcessingPeriod(string pszDeviceName, IntPtr pmftPeriod);
+
+        [PreserveSig]
+        int GetShareMode(string pszDeviceName, IntPtr pMode);
+
+        [PreserveSig]
+        int SetShareMode(string pszDeviceName, IntPtr mode);
+
+        [PreserveSig]
+        int GetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetDefaultEndpoint(string pszDeviceName, Role role);
+
+        [PreserveSig]
+        int SetEndpointVisibility(string pszDeviceName, bool bVisible);
+    }
+
+    [ComImport, Guid(ComInterfaceIds.POLICY_CONFIG_X_IID),
+    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    internal interface IPolicyConfig2
+    {
+        [PreserveSig]
+        int GetMixFormat(string pszDeviceName, IntPtr ppFormat);
+
+        [PreserveSig]
+        int GetDeviceFormat(string pszDeviceName, bool bDefault, IntPtr ppFormat);
+
+        [PreserveSig]
+        int ResetDeviceFormat(string pszDeviceName);
+
+        [PreserveSig]
+        int SetDeviceFormat(string pszDeviceName, IntPtr pEndpointFormat, IntPtr MixFormat);
+
+        [PreserveSig]
+        int GetProcessingPeriod(string pszDeviceName, bool bDefault, IntPtr pmftDefaultPeriod, IntPtr pmftMinimumPeriod);
+
+        [PreserveSig]
+        int SetProcessingPeriod(string pszDeviceName, IntPtr pmftPeriod);
+
+        [PreserveSig]
+        int GetShareMode(string pszDeviceName, IntPtr pMode);
+
+        [PreserveSig]
+        int SetShareMode(string pszDeviceName, IntPtr mode);
+
+        [PreserveSig]
+        int GetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetDefaultEndpoint(string pszDeviceName, Role role);
+
+        [PreserveSig]
+        int SetEndpointVisibility(string pszDeviceName, bool bVisible);
+    }
+
+    [ComImport, Guid(ComInterfaceIds.POLICY_CONFIG_X_RS_IID),
+    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    internal interface IPolicyConfig3
+    {
+        [PreserveSig]
+        int GetMixFormat(string pszDeviceName, IntPtr ppFormat);
+
+        [PreserveSig]
+        int GetDeviceFormat(string pszDeviceName, bool bDefault, IntPtr ppFormat);
+
+        [PreserveSig]
+        int ResetDeviceFormat(string pszDeviceName);
+
+        [PreserveSig]
+        int SetDeviceFormat(string pszDeviceName, IntPtr pEndpointFormat, IntPtr MixFormat);
+
+        [PreserveSig]
+        int GetProcessingPeriod(string pszDeviceName, bool bDefault, IntPtr pmftDefaultPeriod, IntPtr pmftMinimumPeriod);
+
+        [PreserveSig]
+        int SetProcessingPeriod(string pszDeviceName, IntPtr pmftPeriod);
+
+        [PreserveSig]
+        int GetShareMode(string pszDeviceName, IntPtr pMode);
+
+        [PreserveSig]
+        int SetShareMode(string pszDeviceName, IntPtr mode);
+
+        [PreserveSig]
+        int GetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetDefaultEndpoint(string pszDeviceName, Role role);
+
+        [PreserveSig]
+        int SetEndpointVisibility(string pszDeviceName, bool bVisible);
+    }
+
+    [ComImport, Guid(ComInterfaceIds.POLICY_CONFIG_X_RS2_IID),
+    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    internal interface IPolicyConfig4
+    {
+        [PreserveSig]
+        int GetMixFormat(string pszDeviceName, IntPtr ppFormat);
+
+        [PreserveSig]
+        int GetDeviceFormat(string pszDeviceName, bool bDefault, IntPtr ppFormat);
+
+        [PreserveSig]
+        int ResetDeviceFormat(string pszDeviceName);
+
+        [PreserveSig]
+        int SetDeviceFormat(string pszDeviceName, IntPtr pEndpointFormat, IntPtr MixFormat);
+
+        [PreserveSig]
+        int GetProcessingPeriod(string pszDeviceName, bool bDefault, IntPtr pmftDefaultPeriod, IntPtr pmftMinimumPeriod);
+
+        [PreserveSig]
+        int SetProcessingPeriod(string pszDeviceName, IntPtr pmftPeriod);
+
+        [PreserveSig]
+        int GetShareMode(string pszDeviceName, IntPtr pMode);
+
+        [PreserveSig]
+        int SetShareMode(string pszDeviceName, IntPtr mode);
+
+        [PreserveSig]
+        int GetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetDefaultEndpoint(string pszDeviceName, Role role);
+
+        [PreserveSig]
+        int SetEndpointVisibility(string pszDeviceName, bool bVisible);
+    }
+
+    [ComImport, Guid(ComInterfaceIds.POLICY_CONFIG_X_RS3_IID),
+    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    internal interface IPolicyConfig5
+    {
+        [PreserveSig]
+        int GetMixFormat(string pszDeviceName, IntPtr ppFormat);
+
+        [PreserveSig]
+        int GetDeviceFormat(string pszDeviceName, bool bDefault, IntPtr ppFormat);
+
+        [PreserveSig]
+        int ResetDeviceFormat(string pszDeviceName);
+
+        [PreserveSig]
+        int SetDeviceFormat(string pszDeviceName, IntPtr pEndpointFormat, IntPtr MixFormat);
+
+        [PreserveSig]
+        int GetProcessingPeriod(string pszDeviceName, bool bDefault, IntPtr pmftDefaultPeriod, IntPtr pmftMinimumPeriod);
+
+        [PreserveSig]
+        int SetProcessingPeriod(string pszDeviceName, IntPtr pmftPeriod);
+
+        [PreserveSig]
+        int GetShareMode(string pszDeviceName, IntPtr pMode);
+
+        [PreserveSig]
+        int SetShareMode(string pszDeviceName, IntPtr mode);
+
+        [PreserveSig]
+        int GetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetDefaultEndpoint(string pszDeviceName, Role role);
+
+        [PreserveSig]
+        int SetEndpointVisibility(string pszDeviceName, bool bVisible);
+    }
+
+    [ComImport, Guid(ComInterfaceIds.UNKNOWN_IID),
+    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    internal interface IPolicyConfigX
+    {
+        [PreserveSig]
+        int GetMixFormat(string pszDeviceName, IntPtr ppFormat);
+
+        [PreserveSig]
+        int GetDeviceFormat(string pszDeviceName, bool bDefault, IntPtr ppFormat);
+
+        [PreserveSig]
+        int ResetDeviceFormat(string pszDeviceName);
+
+        [PreserveSig]
+        int SetDeviceFormat(string pszDeviceName, IntPtr pEndpointFormat, IntPtr MixFormat);
+
+        [PreserveSig]
+        int GetProcessingPeriod(string pszDeviceName, bool bDefault, IntPtr pmftDefaultPeriod, IntPtr pmftMinimumPeriod);
+
+        [PreserveSig]
+        int SetProcessingPeriod(string pszDeviceName, IntPtr pmftPeriod);
+
+        [PreserveSig]
+        int GetShareMode(string pszDeviceName, IntPtr pMode);
+
+        [PreserveSig]
+        int SetShareMode(string pszDeviceName, IntPtr mode);
+
+        [PreserveSig]
+        int GetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetPropertyValue(string pszDeviceName, bool bFxStore, IntPtr key, IntPtr pv);
+
+        [PreserveSig]
+        int SetDefaultEndpoint(string pszDeviceName, Role role);
+
+        [PreserveSig]
+        int SetEndpointVisibility(string pszDeviceName, bool bVisible);
+    }
+
+    [ComImport, Guid(ComInterfaceIds.POLICY_CONFIG_CID)]
+    internal class PolicyConfigClient { }
+
+    static class PolicyConfig
+    {
+        /// <summary>
+        /// The SetDefaultDevice method sets an audio device as the default device for the role.
+        /// </summary>
+        /// <param name="deviceId">The device id that identifies the audio endpoint device.</param>
+        /// <param name="role">The device role of the audio endpoint device.</param>
+        public static void SetDefaultDevice(string deviceId, Role role)
+        {
+            PolicyConfigClient policyConfigClient = new PolicyConfigClient();
+
+            switch (policyConfigClient)
+            {
+                case IPolicyConfig config:
+                    Marshal.ThrowExceptionForHR(config.SetDefaultEndpoint(deviceId, role));
+                    break;
+                case IPolicyConfig1 config:
+                    Marshal.ThrowExceptionForHR(config.SetDefaultEndpoint(deviceId, role));
+                    break;
+                case IPolicyConfig2 config:
+                    Marshal.ThrowExceptionForHR(config.SetDefaultEndpoint(deviceId, role));
+                    break;
+                case IPolicyConfig3 config:
+                    Marshal.ThrowExceptionForHR(config.SetDefaultEndpoint(deviceId, role));
+                    break;
+                case IPolicyConfig4 config:
+                    Marshal.ThrowExceptionForHR(config.SetDefaultEndpoint(deviceId, role));
+                    break;
+                case IPolicyConfig5 config:
+                    Marshal.ThrowExceptionForHR(config.SetDefaultEndpoint(deviceId, role));
+                    break;
+                case IPolicyConfigX config:
+                    Marshal.ThrowExceptionForHR(config.SetDefaultEndpoint(deviceId, role));
+                    break;
+            }
+        }
+    }
+}