OK Malcolm - Gotcha!
The text on the screen you mentioned is as follows :
"Easy Setting Makes it Simple to Customise Features, Just Press and Hold the Feature's Button for 2 Seconds"

What this means is that several of the buttons have what is termed as an 'Easy Setting' feature - for example : Sound DSP, Mic, Reverb, Multi, Chorus, Technichord, and the Panel Memory 'SET'. This feature allows you to access the parameter setting screen more quickly than going through several menu steps.
So, holding down for 2 seconds, any of the above mentioned buttons, allows you to jump directly to that Feature's setting menu.
Hope this clears up the 'mystery'

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Willum