Envelope Follower, Gate Extractor, VC A/R Envelope

The E-Follower 45B has three complimentary sections
for converting audio source material to control voltage and gate signals.

http://www.modcan.com/bmodules/efollower.html

• 50 mA +15V
• 30 mA -15V
• ? mA 5V
• 94 mm Depth

No info about availability.