EQoder
You can use EQoder as a sound design tool or a melodic extension in your composition
The name EQoder is a wordplay between EQ and Vocoder, since you have to use it like a vocoder but the effect is a modulated cascaded Equalizer. In its resulting function it is an amplifying comb-filter.
The fundamental frequency of each unit/voice is controlled by MIDI notes. Thus, in order to use the effect, you need a MIDI input (or the internal keyboard).
The internal harmonic structure of the comb filter can be adjusted with several parameters.
In order to work with EQoder you route it as an insert filter after an arbitrary audio source (e.g. a synthesizer). Since DAWs are very different in routing insert effects with MIDI please refer to the manual of your DAW.
Think of EQoder as a tool to play a second melody on the harmonic structure of your original sound, or as a further modulation source for each note of your favorite sound