Southwest Technical Products Corporation. Operator Manual for the EX-1 Stereo Compressor- Expander. The cover shows a simply designed device against a graphically complex background. Inside, you will find instructions on Assembly, Expander and Compressor Calibration, Operation and Use, Circuit Operation, a Parts List for Resistors, Capacitors, Semiconductors, and Misc. Furthermore, you will see a Wiring Pictorial and schematics for the unit.