Virtos Filter Toolbox [Click to enlarge] The Filter Toolbox contains a set of versatile digital filtering tools for low-, high- and bandpass filtering and even supports user drawn frequency curves. This functionality is extremely useful when restoring recordings with degraded quality. Features Low-, High- and Bandpass filtering. Three notch filters with variable frequency. Draw the amplification by hand in the Curve Editor. Extremely short transition bands and linear phase response. Listen to the changes by the bypass option. Use any of the factory presets for simple restoration. Supports 24 bits / 96kHz. 32 bits internal processing for superior quality.