Program 1 (P1) - 3 to 38 Hz
In this program the frequency will gradually increases from 3 Hz to 38 Hz and then drop back.
Program 2 (P2) - 1 to 99 Hz
In this program the frequency continually and randomly changes between 1-99 Hz.
Program 3 (P3) - 1 - 99 Hz
In this program you can decide on the level of frequency yourself.