audio equalizer

W2IHY Audio Products - Band audio equalizer and noise gate compatiable with ICOM, KENWOOD, YAESU and other radios

G4URH - Yaesu FT2000 Audio Settings - Yaesu FT-2000 Audio Settings 3 stage Parametric Equalizer Speech Processor OFF

Filtroid - Filtroid is an extremely easy-to-use program for synthesizing microwave filters. It can be used to design practically all filter types from audio to microwave frequencies as well as amplitude and delay equalizers and attenuators.