Rob Hordijk Twinpeak: Difference between revisions

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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.
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]]
[[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 ===
=== 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.
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.


For the OSC SYNC / DUAL ENV / TWINPEAK (pictured right):
OSC SYNC / DUAL ENV / TWINPEAK:


* OSC SYNC - SUB SQR OUT > TWINPEAK IN A
* OSC SYNC - SUB SQR OUT > TWINPEAK IN A