QSI QS-2plus!, Manual

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Section 6 RESET Feature Guide 66
If you choose a transformer other than Auto Select, the new transformer choice
becomes effective when you leave RESET.
QS-2+ is assigned to a Lionel ZW or Dallee transformer
More: About Auto Select
At full throttle settings, all transformer types have a similar type of track voltage
waveform, called a sine wave. Depending on how each of the transformers control track
power, the voltage waveforms all look different at lower throttle settings. It is at these
lower voltages that QS-2+ can distinguish the different types of transformers and make
its selection. This is why you need to lower the throttle so QS-2+ can identify the
transformer.
To get the best performance in "Auto Select," QS-2+ identifies the transformer,
monitors the waveform going to the track, and adjusts to the waveform it is receiving. It
does all this in less than a second. When you are in RESET and lower the throttle, the
air let-off "pssht, pssht" sound tells you QS-2+ has identified the transformer.
ding, ding