The Mu-Tron Bi-Phase is a dual phase-shifter invented and marketed by Musictronics USA in the 70s. It has become well-known and well-loved for it's 'classic' warm and deep sound, as well as the flexibility of it's control and audio-processing capabilities. The Prophecysound Pi-Phase mk2 seeks to accurately reproduce the sound and control layout of the original unit. Design goals for this reproduction of the Bi-Phase were:
to match, as closely as possible, the sound of the original
to maintain the same or a very similar control layout
to package the pedal in a size and format that would allow it to be used live
to dispense with the need for a special controller pedal for switching channels on/off, or for controlling pedal sweep
The Pi-Phase mk2 is all-analog and parts-accurate to the original, as much as is possible. To our ears, and the ears of many previous customers, the Pi-Phase mk2 sounds like the real-deal. How much like it? Original Bi-Phases are pretty old, and some units suffer from parts drift, lack of maintenance, and lack of calibration; each 'well-gigged' Bi-Phase can easily sound different to the next. With the Pi-Phase mk2 we give you 'factory fresh' dual-phaser experience.
The control layout was condensed to fit the targeted pedal format, while still providing a clear and understandable way of operating the unit. The original architecture of the dual LFOs / dual phase shifters has accurately been retained. As per the original, a manual isn't really even needed to explain how the unit works, or what the possibilities are. The resultant format - a pedal 50mm (~2") high, 188mm (7.4") wide and 122mm (4.8") deep - can readily be accommodated on most pedal-boards. The Pi-Phase mk2 is powder-coated and the labels are made out of industrial-strength polycarbonate for looks that will resist the worst live gigs have to offer.
No special extra foot-switch is necessary to operate the Pi-Phase mk2; true-bypass foot-switching for each individual phase channel is built into the pedal. An expression pedal may be connected to the CV PEDAL socket at the rear of the Pi-Phase mk2; the pot in the expression pedal should be connected across the sleeve and ring terminals of a stereo cable, with the wiper connected to the tip. We recommend an expression pedal that incorporates a 10k linear pot (e.g. Boss EV-5, EV-7) for optimal performance. Alternatively, you can connect an external CV signal in the range of 0-5V for controlling the Pi-Phase mk2 from a modular synth or modulation source. Either method - expression pedal or CV - allows controlling of LFO speeds and / or manual sweep of the phase sections.
Each pedal comes with reproductions of the original unit's program cards, including a new preset of Prophecysound design, and some blank program cards to record your own settings. A printed manual, with quick-start and detailed information on the pedal, is also supplied.
Please note these pedals require 9V or 12VDC, negative centre power supply (not included)