The following will allow you to operate the VT911 Vintage Tube Overdrive to its full potential:
1. Connect your guitar to the input jack of the VT911 using a 1/4" instrument cable.
2. Connect your amp to the output jack of the VT911 using a 1/4" instrument cable.
3. Use the OUTPUT control to adjust the overall volume.
4. Use the TONE control to shape the overall sound.
5. Use the DRIVE control to adjust the amount of distortion.
As always, experiment with the controls until the desired effect is achieved.