Hello, the volume control on the Daiyu elliptical trainer FE300 is achieved through the volume increase and decrease buttons on the handle. The specific steps are as follows:

1. Turn on the power of the elliptical machine and press the "Volume +" button on the handle.

2. Keep pressing the "Volume +" button to increase the volume. You can test your adjustments by listening to headphones or the elliptical's built-in speakers.

3. If you need to lower the volume, press the "Volume -" button on the handle until the volume reaches your satisfaction.

Please note that the volume control of the FE300 elliptical trainer only works with the built-in speakers or headphones connected to the elliptical trainer. If you listen to music through other external devices (such as a mobile phone or tablet connected via Bluetooth), you need to adjust the volume through the devices themselves.

Thank you~