Most manual boxes offer only two independent channels. An can create phase shifts. By playing a 50Hz tone on the Left channel and a 55Hz tone on the Right channel, the difference (5Hz) creates a "rolling" or "ghost" sensation inside the body that no single knob can ever replicate.

High Frequencies (500Hz+): These create a "constricting" or "tightening" sensation. At very high levels, it can feel like a solid block of pressure. Safety and Best Practices

Furthermore, is coming. Future generators will read your heart rate or skin conductance (GSR) and modulate the frequency to maintain a plateau of pleasure. If the generator detects you are approaching climax, it will modulate to a different waveform to edge you.