Instruction Manual
UAD Powered Plug-Ins Manual - 243 - Chapter 20: EMT 250 Electronic Reverberator
Each unique parameter in the plug-in retains a distinct value, but only the pa-
rameters that are active in the current program mode are visible in the graph-
ical user interface. All parameters are always visible in Controls View (see 
“Controls View” on page 87), even when they are not active in the current 
program mode.
Important: The value of lever parameters that are not active in the current 
program mode are not saved in sessions or presets. The unsaved parameters 
are marked with an asterisk in Table 17 on page 245.
When switching between program modes that have different parameters 
mapped to the same control, parameter values are retained within each mode 
(controls jump back to the prior value that was set in each respective mode).
Lever 4 Predelay In all program modes, lever 4 controls the predelay (the initial delay before 
other processing occurs) of both channels (left and right). Predelay times of 
0ms, 20ms, 40ms, and 60ms are available in 4 steps. The green LEDs on the 
right side of lever 4 display the current predelay value.
Mono/Stereo 
Operation 
The EMT 250 hardware unit has one (mono) input. For accurate emulation 
when the plug-in is used in a stereo-in/stereo-out configuration, stereo signals 
at the plug-in input are summed to mono before processing; the dry signal is 
passed in stereo.
Four channels of processed audio, selectable with the Front/Rear Outputs 
switch, are generated from this mono input in all modes (with the exception of 
Echo, which has mono output only).
Front/Rear 
Outputs
The EMT 250 hardware unit has four discrete outputs. Two outputs were de-
signed to be used as the main stereo left/right outputs, or the “front” left/right 
outs in quadraphonic applications. The other two outputs were used for the 
“rear” left/right signals in quad (or other creative applications). The UAD 
EMT 250 fully models the individual sonics of all four outputs.
The name of the “Front/Rear Outputs” switch is derived from the original 
hardware design. This control (which is unique to the plug-in) enables access 
to the processed quadraphonic signal in pairs, at either the front L/R or rear 
L/R outputs. When a different sound is available at the front and rear outputs, 
the yellow “LED ring” around the control is illuminated. For program modes 
that do not offer quadraphonic processing (e.g., Delay), the switch is re-pur-
posed to sum the processed outputs to mono. In Echo mode, it functions as an 
input mute.










