Source Audio C4 Synth User Manual page 27

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Drive Knob: Adjusts the amount of distortion.
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Clean Mix Knob: Adjusts the mix ration of clean to distorted signal. Setting the Clean Mix all
the way to left offers a 100% clean mix, all the way to the right is a 100% distorted mix, and
12 o'clock on the knob offers a 50/50 clean/distorted mix.
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Output Knob: Adjusts the overall level of the output signal coming from the Distortion block.
Processor 1 & 2 Filters
The Filters play a crucial role in developing the character of your preset. Basically a filter boosts or
cuts certain segments of a sound's frequency spectrum. Modulating these filters (a.k.a moving them
up and down over the signal) creates an effect similar to many of the sounds we hear in the physical
world (for example the sound of an instrument being struck or that of a human voice). The C4 Synth
has over 20 different Filters to choose from.
Please note that unlike the Distortion Processor, both of the Filter Processors run independently,
meaning that it is possible to simultaneously run two filters simultaneously. The Filter types and
parameter controls for Processors 1 and 2 will run independently of one another.
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On Button: Engages or disengages the Filter module.
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Voice Mix Monitors: The four meters labeled Voice 1 through 4 monitor the Processor 1 & 2
ratio of each Voice routed to the Filter.
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Filter Type Dropdown Menu: Choose from any of the C4's 28 different filter types.
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Invert Button: Inverts the direction of the filter modulation. For example if a single low-pass
filter is set to modulate its cut-off point from the lower frequencies to the higher frequencies,
the Invert button will change the direction of the filter modulation and move it from the
higher frequencies to the lower frequencies.
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Depth Knob: Adjusts the breadth of the filter modulation. As the Depth knob is increased, so
does the frequency range over which the filter moves.
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Frequency Knob: Adjusts the starting point of the filter modulation. Turning the knob to the
left causes the filter to modulate over lower frequencies and turning the knob to the right
causes the filter to modulate over higher frequencies.
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Q Knob: Adjusts the intensity (also referred to as "resonance") of the filter. Increasing the Q
knob essentially boosts the height (or "level") of the frequency peaks and deepens the
notches in the frequency cuts.
SA249 C4 Synth User Guide 27