The Highpass VCF Voice Card for the Erica Synths Bullfrog adds an analogue, slightly resonant high-pass filter to the synthesizer's signal path. A toggle switch allows you to select whether the cutoff parameter should be modulated with LFO, S&H or EG2. CV Level sets the modulation intensity. Depending on the position of the green cutoff control, the Highpass filter also produces bandpass sounds.
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