One of the new features the Stec Special ROM adds to the JamMan is a dry signal level control. This allows you to remotely control the wet/dry mix through the system.

When using the dry signal path, the MIX knob on the JamMan front panel must be set for 100% wet.
 

Note that when using the controllable dry signal path through the JamMan, the dry signal is summed to mono. If you are using the JamMan in a configuration where the dry signal through the system must remain in STEREO, set the Dry Level parameter to 0.