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→Normalisations
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▲}} -->[[File:TWINPEAK.png|thumb|602x602px|Panel design for a Rob Hordijk TWINPEAK filter]]
The TWINPEAK is a module by [[Rob Hordijk Design|Rob Hordijk]] consisting of two 18dB low-pass filters in parallel, and a built in [[Voltage controlled amplifier|VCA]].
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For example if the curve knob is closed the IN A signal only goes into filter one and in the final output you only hear the effect of filter one on the IN A signal. And thus it has a low-pass response as filter two does not get the input signal. That means that there is also not the subtraction at work that create the band-pass, as filter two gets nothing to subtract from the output. Then, by opening the IN A curve knob, the signal level of IN A into filter two is increased and now there is something coming out of filter two and the final output curve changes towards a band-pass curve.
[[File:RobHordijk-OSCSYNC-DUALENV-TWINPEAK.jpg|thumb|A Rob Hordijk TWINPEAK filter (right) in triple-module format with a DUAL ENV (centre) and OSC HARM (left)]]
=== Normalisations ===
Many of Rob's designs feature internal connections or 'normalisations' between inputs and outputs. These can be broken by inserting jacks into the inputs. The TWINPEAK filter often appeared in a triple-module configuration, featuring some module-to-module normalisations or connections between inputs and outputs.
* OSC SYNC - SYNCED OUT > TWINPEAK IN B▼
*
▲* OSC SYNC - SYNCED OUT > TWINPEAK - IN B
* DUAL ENV - ENV A OUT > TWINPEAK - VCA CV
== References ==
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== External Links ==
* Rob explains the TWINPEAK filter at NOVARS (2017) - https://vimeo.com/240797280
*[https://thehordijkmodular.blogspot.com/2018/02/the-twinpeak-filter-best-filter-ever-in.html The Best Filter Ever?] by Benoit Faivre
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