AP099
Revision 1.01
CM100B
Introduction To This Guide
Why This Guide?
The Behringer Pro-1 is a great synthesiser, but is delivered with little documentation. The
original Pro-One that the synthesiser is based on had a more detailed explanation, so in
learning how to use the Pro-1, the author was using this manual. This document is an effort to
consolidate that information and add other relevant information in one concise and clear
guide.
Information here is provided without warranty or liability. Please forward any suggestions or
corrections by email to [email protected].
Conventions & Naming
This guide is transcribed and adapted from the original Sequential Circuits Pro-One Manual.
It has been adapted to cover both the Behringer Pro-1 clone.
The original Pro-One synthesiser had a keyboard. Where “keyboard” is mentioned, then
MIDI input is normally implied for the Behringer Pro-1. This MIDI input may be from a Digital
Audio Workstation (DAW) such as Logic Pro or directly from a MIDI keyboard controller.
The synthesisers are referred to as Pro-One or Pro-1 where they are mentioned specifically.
Safety Instructions
For statutory information & safety instructions refer to the Quick Start Guide supplied by the
manufacturer with the Pro-1.
About the Synthesisers
The Sequential Circuits Pro-One
The Pro-One was a monophonic (one-voice) keyboard synthesiser, now out of production. Its
principal sound sources are two voltage-controlled oscillators (VCOs), referred to as OSC A
and OSC B. OSC A, OSC B, and a white noise source can be mixed into the resonant low-
pass filter (VCF). The filter modifies the voice timbre under control of its four-stage envelope
generator. The filter may also serve as a sound source. This stage is followed by a voltage-
controlled amplifier (VCA), which shapes the voice amplitude also under control of a four-
stage envelope generator. The keyboard provides frequency control voltage (KYBD CV) for
the oscillators and filter, and generates a GATE which controls the envelope generators.
In addition to this basic voice, the Pro-One has extensive modulation provisions. Three
modulation sources are available: the filter envelope generator (FILT ENV), OSC B, and a
separate low-frequency oscillator (LFO). Each can be mixed and routed for either DIRECT or
WHEEL-controlled modulation of five destinations: OSC A frequency (FREQ), OSC A pulse-
width (PW), OSC B FREQ, OSC B PW, and filter frequency (FILTER).
This complement of analogue synthesiser modules and the routings provided for their
interconnection have been well-proven in the Pro-One's ancestors, the Prophet-5 and
Prophet-10 polyphonic synthesisers. Besides allowing the synthesist to play up to five or ten
notes at one time, these two instruments contain microcomputers which program all the
control settings comprising a sound. The Pro-One is neither preset nor programmable: you
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