The next step is to include the model instances for the model components we need for the sine modulator example. Follow the steps below to add the instances for the `Sine Generator`, `Sine Modulator`, and `Sine Modulator System`.

### Add model instances to Sine Generator

- Open the
`Sine Generator` module.
- Expand the library
`MLD Libraries→SDF Domain→Sources`.
- Drag the item
`Ramp` into the Model Editor Window.
- Expand the library
`MLD Libraries→SDF Domain→Nonlinear`.
- Drag the item
`Sin` into the Model Editor Window.
- Arrange the components in the Model Editor Window as shown below.
- Save the model using the tool button
**Save Model**.

Ignore the construction errors. The error is displayed because there is no output/input port for the module and/or the ports are not connected or terminated.

### Add model instances to Sine Modulator

- Open the
`Sine Modulator` module.
- Expand the library
`MLD Libraries→SDF Domain→Arithmetic`.
- Drag the item
`MpyFloat` into the Model Editor Window.
- From the
**Select Special Primitive** dialog select `MpyFloat.Input=2`.
- Expand your library
`Sine Modulator Library`.
- Drag item
`Sine Generator` into the Model Editor Window.
- Arrange the components as shown below and
**Save** the model (Ignore construction error messages).

### Add model instances to Sine Modulator System

- Open the
`Sine Modulator System`.
- Expand the library
`MLD Libraries→SDF Domain→Sinks`.
- Drag the item
`XMGraph.Input=1` into the Model Editor Window.
- Expand your library
`Sine Modulator Library`.
- Drag the items
`Sine Generator` and `Sine Modulator` into the Model Editor Window.
- Arrange the components as shown below and
**Save** the model (Ignore construction error messages).

The next step will be to set parameters of model instances.