Controls
Bypass Switch: Turns the effect off or on.
Tap/Mode Switch: Tapping the switch in time starts the sample/hold filter.
Holding the switch down for one second switches back to envelope filter mode.
Frequency: Filter resting point.
Depth: Filter modulation range for both envelope follower and sample hold mode.
1-2-4: Step multiplier. One, two or four steps per beat (sample hold mode only).
Proteus is powered externally only with a standard 9V negative center 2.1mm barrel adapter.
A 12 volt power supply can be used for increased headroom.