FILThy by After Later Audio is a good sounding analog multimode filter that is recommended for most applications. The four filter modes that can be used in parallel - lowpass, bandpass, Highpass and notch - seem very well balanced in their working ranges. Moreover, the resonance in all modes extends to self-oscillation. The two audio inputs don't have their own level controls, there are two of them for the control voltage inputs of Cutoff and resonance. FM2 is recommended as a keytracking input.