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- Order number: 190058
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River’s Marble is subtle. That is exactly his strength. Depending on the mode selected, Marble is a tilting tone control that raises bass and lowers high frequencies (and vice versa) or a midrange equalizer with a fixed frequency and boost/cut - always sounding with a light vintage touch. Marble actually fits many places within a patch: Directly behind the oscillator, filter or "end-of-chain" to balance (in stereo) the overall sound image. The module especially shines in feedback loops of (spring) reverbs and delays.
Marble is called "Dual spectral tilting tone control" by the manufacturer and is built around a discrete OTA transistor all-pass filter circuit(s).
“Dual” means that there are two independent, identical channels, which can also work as stereo pair (via the "tone link" switch). At the input the signal can be lowered by -6dB via the "Pad" switch. At higher levels the module moves into a (soft) saturation. The behaviour of the circuit is always rather subtle, but -with/due to a 3db/oct slope– also very "natural"sounding.
It is switchable via the "Shape" switch between "spectral tilting" or can be used as a bell curve equalizer with fixed frequency. Commonly tone controls can be found e.g. on stereo systems to quickly balance the sound. Also here this can be done with (just) one potentiometer. Moving it to the left boosts the low and dampens the high frequencies...the other way around when moving it to the right. In equalizer mode, the pot boosts or cuts the frequencies around a fixed frequency in form of a wide bellshape.
For each channel there is a CV input associated with this potentiometer. This is especially useful in the feedback loop of Delay and Reverbs to create rising or receding swellings. With very fast CVs, the phase shift caused by the allpass filter circuit design becomes noticeable and can be abused as a subtle vibrato-like effect.
In both modes, feedback causes the effect to deepen. With the signal getting sharper the feedback knob can also be used to finetune the saturation.
Marble, you will soon notice, can be used in many places in a patch and is a wonderful “spectral utility”!
|Power consumption +12V:||70|
|Power consumption -12V:||60|