This changes shifts the range by a 0.125 factor but maintains V/O tracking. This gives you a range of 64s per cycle (min position of the slider) to 4 Hz (max position).
If you don’t mind losing V/O tracking, you can change the 96.0f constant two lines above to 120.0f. You’ll get a 10 octave range over the course of the slider (from 16s per cycle to 64Hz).
If you combine both changes (120 instead of 96, and the 0.125 factor), you get a range that goes from 128s per cycle to 8 Hz.