Audio Developments AD255 User Manual
Page 19

18
An overload LED (12) illuminates 3dB before clipping at the input to the fader.
The Penny & Giles fader (18) is calibrated 10dB from its fully open position,
allowing the operator to work with 10dB of gain in reserve. Faders on adjacent
modules can be coupled for stereo operation by the use of standard ganging clips.