X-Phase from Solid State Logic is an all-pass filter plug-in that offers the user manual control and high quality response. It enables the user to apply a phase shift (sometimes called a phase offset) at a specified frequency within a signal. Unlike other filter types where the gain of selected frequencies is altered, with an all-pass filter the gain remains unchanged throughout the signal. This is useful for fixing phase problems with microphones when recording, such as overheads causing phase problems when mixed with close mics. X-Phase can also be used to create a comb filter by applying a filtered signal to an unfiltered version of the same signal. With X-Phase the controls are simple: a Frequency control selects the desired frequency where a phase offset needs to be applied, a Q control sets the slope of the curve of correction to be applied across the signal and a phase invert button enables the phase of the filter to be flipped 180 degrees. A separate Delay section is applied to the entire signal for broader time alignment of the signal. The Delay controls can be set to display and adjust in seconds, milliseconds, samples, meters or feet.