Where is the shift button on the vci-400?!?

Where is the shift button on the vci-400?!?

I can’t find it anywhere. I just got it yesterday and I’m absolutely stumped. Please help me! Thanks!

On a VCI400-EGE - It is on the top section of the controller, in the middle and directly under the Master Volume control.

On a Standard VCI400 - I am not sure - but I would imagine it would be in a similar place.