Initial Commit. Kind of sloppy first-pass at the intended functionality.

Arguably rushed for purpose of posting to forum before I forgot why I was creating it, heh.

App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.3" />
+    </startup>
+</configuration>

Program.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Runtime.Remoting.Channels;
+using System.Security.AccessControl;
+using System.Text;
+using System.Threading.Tasks;
+using Vannatech.CoreAudio.Enumerations;
+using Vannatech.CoreAudio.Interfaces;
+
+namespace VolumeSlapper
+{
+    //quick console program slapped together to retrieve/set volume on Windows Vista and later.
+    //I guess I should have checked the OS of the issue, oh well.
+    class Program
+    {
+        private static String HelpText = @"
+VolumeSlapper Command-Line Volume Utility. v" + Assembly.GetEntryAssembly().GetName().Version.ToString() + @".
+ Syntax:
+ VolumeSlapper (operation) [volumelevel]
+ 
+ operation: either get or set. get doesn't require an argument; set requires the volumelevel argument.
+
+ volumelevel: a value parsable as a floating point value between 0 and 1 to use as the volume level. used only for the set operation.
+
+ examples:
+   Retrieve current audio level:
+   {0} get
+   set current audio level to 50%:
+   {0} set 0.5
+";
+        static void Main(string[] args)
+        {
+
+            //we won't bother with fancy argument parsing here, just look at the buggers directly.
+            if(args.Length==0)
+            {
+                ShowHelp();
+                return;
+            }
+            else if(args.Length>0)
+            {
+                if(String.Compare(args[0],"get",StringComparison.OrdinalIgnoreCase)==0)
+                {
+                    //get logic
+                    float currvolume = VolumeUtilities.GetMasterVolume();
+                    Console.WriteLine(currvolume);
+                }
+                else if(String.Compare(args[0],"set",StringComparison.OrdinalIgnoreCase)==0)
+                {
+                    //set logic.
+                    float assignvolume;
+                    if(!float.TryParse(args[1],out assignvolume))
+                    {
+                        Console.WriteLine("Specified volume level not valid:" + args[1]);
+                        Console.WriteLine();
+                        ShowHelp();
+                        return;
+                    }
+                    else
+                    {
+                        VolumeUtilities.SetMasterVolume(assignvolume);
+                        Console.WriteLine("Volume Level set to " + assignvolume);
+                    }
+                }
+                else
+                {
+                    Console.WriteLine("unrecognized parameter:" + args[0]);
+                    Console.WriteLine();
+                    ShowHelp();
+                    return;
+                }
+
+
+            }
+
+
+            Console.ReadKey();
+        }
+        static void ShowHelp()
+        {
+            String sHelpText = String.Format(HelpText, Path.GetFileNameWithoutExtension(Assembly.GetEntryAssembly().Location));
+            Console.Write(sHelpText);
+        }
+    }
+
+
+    public static class VolumeUtilities
+    {
+        public static float GetMasterVolume()
+        {
+            // retrieve audio device...
+            IMMDeviceEnumerator useenumerator = (IMMDeviceEnumerator)(new MMDeviceEnumerator());
+            IMMDevice speakers;
+            const int eRender = 0;
+            const int eMultimedia = 1;
+            //retrieve the actual endpoint
+            useenumerator.GetDefaultAudioEndpoint(eRender, ERole.eMultimedia, out speakers);
+
+            object o;
+            //retrieve the actual interface instance to retrieve the volume information from.
+            speakers.Activate(typeof(IAudioEndpointVolume).GUID, 0, IntPtr.Zero, out o);
+            IAudioEndpointVolume aepv = (IAudioEndpointVolume)o;
+            float result;
+            aepv.GetMasterVolumeLevelScalar(out result);
+            Marshal.ReleaseComObject(aepv);
+            Marshal.ReleaseComObject(speakers);
+            Marshal.ReleaseComObject(useenumerator);
+            return result;
+        }
+        public static float SetMasterVolume(float newValue)
+        {
+            // retrieve audio device...
+
+            IMMDeviceEnumerator useenumerator = (IMMDeviceEnumerator)(new MMDeviceEnumerator());
+            IMMDevice speakers;
+            const int eRender = 0;
+            const int eMultimedia = 1;
+            //retrieve the actual endpoint
+            useenumerator.GetDefaultAudioEndpoint(eRender, ERole.eMultimedia, out speakers);
+
+            object o;
+            //retrieve the actual interface instance to retrieve the volume information from.
+            speakers.Activate(typeof(IAudioEndpointVolume).GUID, 0, IntPtr.Zero, out o);
+            IAudioEndpointVolume aepv = (IAudioEndpointVolume)o;
+            float result;
+            int hresult = aepv.GetMasterVolumeLevelScalar(out result);
+            aepv.SetMasterVolumeLevelScalar(newValue,new System.Guid());
+            Marshal.ReleaseComObject(aepv);
+            Marshal.ReleaseComObject(speakers);
+            Marshal.ReleaseComObject(useenumerator);
+            return result;
+        }
+        [ComImport]
+        [Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")]
+        private class MMDeviceEnumerator
+        {
+        }
+
+    }
+
+
+}

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("VolumeSlapper")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("VolumeSlapper")]
+[assembly: AssemblyCopyright("Copyright ©  2015")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("527092e8-5000-406d-8bff-662e371b3d1c")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

VolumeSlapper.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{09C31B32-7D6A-420A-830A-72BA62D244F4}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>VolumeSlapper</RootNamespace>
+    <AssemblyName>VolumeSlapper</AssemblyName>
+    <TargetFrameworkVersion>v4.5.3</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+    <Reference Include="Vannatech.CoreAudio">
+      <HintPath>..\..\..\..\Downloads\Vannatech.CoreAudio.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

VolumeSlapper.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2013
+VisualStudioVersion = 12.0.31101.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VolumeSlapper", "VolumeSlapper.csproj", "{09C31B32-7D6A-420A-830A-72BA62D244F4}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{09C31B32-7D6A-420A-830A-72BA62D244F4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{09C31B32-7D6A-420A-830A-72BA62D244F4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{09C31B32-7D6A-420A-830A-72BA62D244F4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{09C31B32-7D6A-420A-830A-72BA62D244F4}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal