Single VFO Limitation

Observation: The UI is designed around a single "Center Frequency" and one active demodulator.

Expectation: Modern SDR software often allows multiple "VFOs" (Variable Frequency Oscillators) or "Demodulators" within the visible bandwidth.

• Example: With 20 MHz bandwidth, a user could listen to an air traffic controller on 118.1 MHz and a weather station on 162.55 MHz simultaneously (if both fit in the span).

Impact: The application underutilizes the wide bandwidth of devices like the HackRF. Users can see signals in the waterfall but can only listen to one at the center frequency.