== Understanding Gain, External VC, VC Range ==
{{:ezfit:ezfit-gainvsextvc.png|Gain vs. External VC}}

=== VC Range ===
{{:ezfit:ezfit-extvcvsvcrange.png|External VC vs. VC Range}}

A Heurictic value for VC Range should be :
  * 50dB (Default): Mild hearing loss.
  * 40dB - 30dB: Mild-Moderate hearing loss.
  * 30dB - 20dB: Moderate hearing loss.
  * 20dB - 10dB: Severe hearing loss.