ref: 765bd487689586be946653397bcaf6d08cdbd4cc
parent: bc99f48aca15efd07cb81853172b95e83076314f
author: spiricom <jeff@snyderphonics.com>
date: Sat Jan 25 07:49:22 EST 2020
fixed linear interpolater, added hermite interpolation, fixed issues in formant shifter