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* Formant filters - raise multiple peaks, often in such a way that they mimic the human voice.
* State variable filters - e.g. include simultaneous low-pass, high-pass and band pass outputs as well as voltage controllable cut off frequency and resonance (Q)
* Comb filter - adding a delayed version of a signal to itself, causing constructive and destructive interference.
There are many ways to implement most filters, and each has its own specific audio characteristics or flavour. Some common features across most filter types include:
* A cut-off frequency - the frequency at which the filter begins to remove frequencies. This is often voltage-controllable and can changes over time (e.g. controlled by an [[Envelope generator|envelope]], or an [[Low frequency oscillator|LFO]]).
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