Waldorf Q Keyboard User Manual
Also see for Q Rack: User manualUser manual
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Sound Parameters – Filter77 Waldorf Q User’s Manual• Turning the knob clockwise will increase the amount of signal that is sent to the panningunit of Filter 1 and decrease the amount of signal that feeds the input of Filter 2.• Fully clockwise, the Routing parameter is set to127. Then the whole output signal ofFilter 1 is routed to the filter’s panning unit. This setting is equivalent to a parallel routingof two filters, each filtering the input signals independently.• After passing the panning units, both signals are summed up again and sent to theAmplifier and FX sections.FilterOnce the audio signal leaves the mixer, it is sent to the filters. The Q has two independent filter units,each with its own individual settings. The signal flow in the filters can be controlled in the Routingsection. The filters are components that have significant influence on the Q’s sound characteristics.For a detailed description of the different filter types that are available in the Q, see the section “FilterTypes”. For now, we explain the basic function of a filter with the filter type that is used mostcommonly in synthesizers: the low pass filter.The low pass filter type dampens frequencies that lie above a specified cutoff frequency. Frequenciesbelow this threshold are hardly affected. The frequency below the cutoff point is called the pass bandrange, the frequencies above are called the stop band range. The Q’s filter dampens frequencies inthe stop band with a certain slope. The slope can be 12dB or 24dB per octave. This means that thelevel of a frequency that lies an octave above the cutoff point will be 12dB or 24dB less than thosefrequencies of the signal that fall into the pass band. The following picture shows the basic principleof a low pass filter:FrequencyLevelCutoffPicture 23: Low Pass Filter principleTo give you an idea of the extent of damping, consider this example of a low pass filter: A reductionof 24dB reduces the original level one octave above the cutoff point by approx. 94%. The dampingfactor two octaves above the cutoff point reduces the original level by more than 99%, which in mostcases means this portion of the signal is no longer audible.The Q’s filter also features a resonance parameter. Resonance in the context of a low, band or highpass filter means that a narrow frequency band around the cutoff point is emphasized. The followingpicture shows the effect of the resonance parameter on the filter’s frequency curve: |
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