Should a BC109C make noise and hum when I touch its body?

[Philtre]

I've built the Lunar Module Deluxe pedal here - http://tagboardeffects.blogspot.co.uk/2012/02/great-modern-take-on-classic-fuzz.html

Schematic - http://4.bp.blogspot.com/-jtoWoktqNs4/T0AQyiJsOUI/AAAAAAAAA8A/U5vbjO3-zig/s1600/lm_scheme.gif

Here's the thing. If I wind up the Pre-Gain and Fuzz controls and put my finger on the metal body of Q1 (BC109C) there is a loud hum and noise, like that when you touch the end of a guitar jack with your finger. Should a transistor react in this way?