compression from 1:1 (no compression) 
up to 
∞
: 1 (no increase in output level, 
regardless of input level increases 
above threshold).  When the RATIO is 
∞
: 1, it can be used as a limiter.  When 
the RATIO is1:1, it can be used as a 
clean booster.
⑤GAIN (gain control knob)
Controls output level.  When strong 
compression is set by THRESHOLD and 
RATIO, output level goes down.  (Fig. 3)  
Turn GAIN control knob clockwise to 
have the same volume as Bypass 
functions.  Output level can be 
boosted up to +30dB so that when the 
RATIO is1:1, it can be used as a clean 
booster. 
⑥REDUCTION LED (reduction indicator)
The LED lights when output level is 
compressed more than +3dB vs. input 
level.
Refer to OD9 pages for ⑦⑧⑨.
⑦FOOTSWITCH
⑧INDICATOR
⑨DC. IN.
THRESHOLD RATIO GAIN
17
ENGLISH
CP9Pro+
●True Bypass Switching with 4PDT lets your instrument’s signal pass through 
a non-electronic bypass line when the effect is disengaged, feeding your 
amp with direct, unaltered signal from your instrument.
●Easy-access, no tools battery compartment.