Penpower Picasso (Win/Mac) - Manual (Page 9)

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Tablet Preferecnes Setting: Express Keys
This menu is to configure the 10 “ExpressKeys” on both sides
of the Muse tablet.
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MacroKey Response Time setting:
You can set timer for how long MacroKey function will work.
There are 5 different choices; 0, 0.5, 1, 2 and 3 seconds.The
timing you choose will determine how long you must hold pen on
MacroKey before it activates.You can choose to get the pointing
sound or not while the pen tip is pointing on the Tablet.