As a first try, it would not be nessecary to move from the room during the trial. If you sit in the sofa/chair and state the commands, e.g. switch:

And your wife lowers the volume to zero make the switch from CD to Tuner input and raise volume again until you say "stop". She can adjust the volume if you say higher or lower, but it is important that you make the choices, not she.

At the next command "switch" from you, she repeat the procedure but switch bac to CD. And this can continue for some time, until you write down what is on "CD" and on "Tuner". You can make notes during the time so you don't mix up the inputs and are free to listen for how long time you want.

When you leave the room, that is the signal for your wife to switch cables according to a random scheme. When she is ready, trial number 2 starts.



T