KEYTEK CTS 2000 Instruction Manual page 37

From E.G. Level.
Parameter : DECAY
Power meter : E
Display Par. DECAY TIME 2 ( z )
OLD xx NEW yy
Value xx/yy : from 1 to 16
Function : Selects the time by which the frequency of Oscillator 2 will return from the value reached
After the Attack time, to the normal tuning value.