BatchDrake/SigDigger — reverse-engineered prompt

Build me a desktop app for GNU/Linux and macOS that helps me inspect unknown radio signals from SDR hardware. I want to plug in a supported SDR through SoapySDR, tune around, and see a live spectrum and waterfall so I can click on interesting signals and analyze them.

The app should feel like a simple radio analyzer, similar in spirit to Gqrx, but focused on digging into digital signals. Let me adjust demodulation for FSK, PSK, and ASK, listen to analog voice channels in real time, inspect bursty signals, and decode analog video when possible. I’d like the interface to be clean, with controls that make sense for someone experimenting with signals, not buried in complicated menus.

Use Qt for the GUI and the Suscan and Sigutils style DSP backend if that’s appropriate. Please make it buildable from source, include the needed setup notes, and look up current docs online if you need to.