This tutorial pertains only to applications written in C++. See DirectMusic Visual Basic Tutorials.

This tutorial shows how a tool might be implemented as a C++ class and used in a DirectMusic application. The CEchoTool class enables an application to add one or more echoes to every music note in a performance.

The sample code is based on the EchoTool sample application included with the DirectX SDK.

The tutorial is broken down into the following steps:

• Step 1: Declare the Tool Class
• Step 2: Define the IUnknown Methods
• Step 3: Specify Message Types
• Step 4: Define the ProcessPMsg Method
• Step 5: Define the Class Methods
• Step 6: Add the Tool to the Performance