Revert "Introduce new VCO logic based on FFT"
Revert "Introduce new VCO logic based on FFT"

This reverts commit 0d3dd1491f23be8239626d125196be610533bca0.

eriser/digital-synth-wra32,risgk/digital-synth-wra32,eriser/digital-synth-wra32,risgk/digital-synth-wra32