Empress Effects Buffer+ - Manual (Page 10)

Alternate Use
The buffer and buffer+ can also be used
to split the input signal to multiple
outputs. The input signal is normally
routed to the loop out and tuner out.
When nothing is connected to the loop
in jack, the input signal will also be
routed to the amp out jack, essentially
making the buffer a 1in 3out splitter.
This could be useful to run multiple
amps or to record a second dry signal
when tracking for re-amping later.
note: the grounds of each output are
not isolated, and connecting to multiple
sources could cause a ground loop.
Lifting the audio ground (not the power
ground) on one of the devices
connected to the ouputs should solve
ground loop issues.