What to do with MUTE in K4003 kit?

Hi,

I started assembling the K4003 HIFI Amp kit, and all is going well.

But what am I supposed to do with the MUTE indication on the PCB? It obviously has to do with the ‘Transient surpression on/off switch’ mentioned in the building manual. But what to do with it? What kind of switch do I need, and how do I operate it? Is it meant to be an ON/OFF switch? And why isn’t it supplied with the kit?

Regards, Ron Vonk