Yamaha CS80

Hi folks,

OK I'm gonna tune her again, it's about time....

I did it a few years ago and at the time I did the 'touching-the
screwdriver' thing to "hear" which board was active.

Since then though, I have heard on here that this can lead to blown
components. I also remember one of you had an LED panel to indicate
the status.

My questions is, without any special gear -(I am using a digital
multimeter with onboard frequency counter for tuning)- how should I
monitor which card/voice is active and not be in danger of blowing
anything please?

Cheers
TOM