Boulder Amplifiers 1012 DAC Preamplifier - Manual (Page 19)

INPUT SELECTIONS
To select an analog input, press one of the ANALOG pushbuttons
labeled ONE, TWO, THREE or PHONO. The respective input will be
shown in the display and that signal will be routed to both the main and
record outputs. For example, if input ONE is chosen, “A1. ANALOG
INPUT 1” will show in the display.
NOTE: There will be a 1 second delay when switching from one
source to another. This is necessary to allow the circuitry to adjust to the
new input source.
OPERATION
2-2