The ATT-4 consists of four independent manual attenuators and it is ideal as interface between modulation sources and modules with direct CV inputs (not attenuable CV inputs). It has additionally LEVEL/BIAS SHIFTERS which converts nominal signals ±5 Volts (such as VCO-2RM or D-LFO outputs) to a positive signal (0 to 5 Volts) for controlling of parameters, such as level, Q-peak and other with the controlling voltage range of 0 to 5 Volts.
The LEVEL controls the outgoing signals amplitude from 0 to the maximal level.

http://www.cwejman.net/att-4.htm

• 10 mA +12V
• 10 mA -12V
• ? mA 5V
• 40 mm Depth

No info about availability.