User Manual
DUAL EXPRESSION PEDAL 
USER’S GUIDE 
SA161 
Thank you for purchasing the SA161 Dual Expression Pedal.  This rugged, cast-aluminum expression pedal 
features two independent Expression Outputs as well as a Sensor Output for use with Source Audio 
Soundblox effects pedals.  The dual TRS expression outputs allows the SA161 to control two Soundblox Pro 
(or other 3
rd
-party ) units simultaneously. 
The SA161 outputs are arranged on either side of the pedal. The two outputs have different functionality 
and are completely independent circuits. 
OUTPUT 1 (right side): 
• EXP OUT 1 (TRS): 50 kOhm passive 
expression output.  Connect to an 
expression input on Soundblox Pro or 3
rd
-
party effects pedals using the included ¼-
inch TRS cable. 
• SENSOR OUTPUT: Connect to the SENSOR 
INPUT on Soundblox, Soundblox 2, 
Soundblox Pro, and Hot Hand effects 
pedals.  Connect using the included 4-
conductor 3.5mm cable. 
OUTPUT 2 (left side): 
• EXP OUT 2 (TRS): 50 kOhm passive 
expression output.  
• RANGE ADJUST: an additional 50 kOhm 
adjustment potentiometer is arranged in 
series with the EXP OUT 2 potentiometer.  
When the knob is fully clockwise, the 
range adjust has no effect.  The knob can 
be turned counter-clockwise to reduce the 
range of the EXP OUT 2 pot. 
Note: Expression Output and Sensor Output can NOT be 
used simultaneously! 
SENSOR OUTPUT 
EXPRESSION OUT 1 
RANGE ADJUST 
EXPRESSION OUT 2 
For technical support, please email us at contact@sourceaudio.net 
Note: The RANGE ADJUST only affects the EXP OUT 2. 

