gQ is a real-time para-graphic audio equalizer compiled in the Silicon Graphics Irix operating system. It is capable of processing audio in real-time, allowing for intuitive modification of filter parameters. It is para-graphic in that its interface is arranged with multiple "bands" in the familiar layout of a graphic equalizer, while the parameters of each band are freely adjustable, as with parametric equalizers. gQ's filter is of recent design (Zölzer and Boltze, 1995), and has many features that make it particularly attractive to those who work regularly with sound: it de-couples the three main parameters (center frequency, gain, and bandwidth), it exhibits minimum phase, it is insensitive to coefficient roundoff error, and it is computationally efficient.
