This Pedal is discontinued.
4 / 8 / 12-stage "programmable" phaser
Supposedly optimised for bass and keyboards (hence B/K). "Programmability" just uses blind TRS plugs with different bridging resistor values to offset the phaser center-frequency response. You can also plug an expression pedal into the 'program' socket to control the phaser sweep.
TC Electronic TC Electronic XII B/K
TC Electronic TC XII Phaser
TC Electronic TC Electronic XII