Low frequency band
Modulatable within 50 Hz - 199 Hz; 70 Hz as a typical measuring point, 1 Hz/step
Medium frequency band
Modulatable within 0.5kHz - 1.9kHz; 1kHz as a typical measuring point, 100Hz/step
High frequency band
Modulatable within 2kHz - 16kHz; 5kHz as a typical measuring point, 100Hz/step