Mine will light up not just on multiplers but after ever qso, well I am a qrp operator :-)
The additional bit is in the code. QRO ops can edit it out.
|#define DISPLAY_EVERY_QSO // Comment out this line if you DO NOT want a visual alert when a QSO is logged.|
|//#define SOUND_EVERY_QSO // Comment out this line if you DO NOT want an audible alert when a QSO is logged.|
|For the rest of the code:|
I use the win-test derivative. (Thanks M1DST for adding).
I will add in my own 'on air' sign too. It uses an LED strip to illuminate.