REVA v4.0 - Operator Notes

Edit the experiment at the top of the .ino file.

1) Choose carrier:
   #define CARRIER_HZ 120000UL

2) Choose one packet category:
   #define PACKET_ACTIVE_CATEGORY PACKET_CAT_HARMONIC

3) Optional starting family inside that category:
   #define PACKET_START_FAMILY 0U

4) Upload firmware.

The 4 buttons now tune only inside the selected experiment category.
They do not force the operator to scroll through all 100 packet families.

Button behavior:
- DUTY UP / DOWN: scale pulse counts
- FRQ UP / DOWN: scale gap times
- FRQ UP + FRQ DOWN hold: next family inside selected category
- DUTY UP + DUTY DOWN hold: previous family inside selected category

The carrier frequency remains independent from packet geometry.
