This iOS 8 app makes use of Novocaine (@alexbw) and NVDSP (@bartolsthoorn) to implement a parametric Equalizer with only one peaking EQ filter using a biquad section. The filter's magnitude response is plotted and can be interacted with by using pan and pinch gestures on the view, which changes center frequency, gain and q factor.

• DSP methods to calculate filter coefficients (based on NVDSP) and magnitude response
• scalable UIView subclass EQView, which draws the magnitude response on a lin-log graph (gain - frequency)
• possibility to pick songs from the iTunes library or to use microphone input
• display of the filter parameters with possibility to toggle between Q and bandwidth

• interpolation of filter coefficients (or at least parameters fc, g, q)