1. The problem statement, all variables and given/known data I am to construct a circuit which can provide variable gain for the bass, midrange, and treble frequencies of an input. One of the stipulations is that I should use as few elements as possible. 2. Relevant equations n/a 3. The attempt at a solution Right now the only solution I can think of is cascading three band pass filters, each with cutoffs for the frequencies relating to bass, mid-range, and treble, and each with variable resistors to change the gain, but I think there's probably a better way to implement this. Is there a way to separate the various frequencies so that I can connect three variable resistors in parallel and use only one op amp, as opposed to three?