slider value | output power [wattage] | ( bonus explanation FWIW )
100% -0 dB 2 V output ( de facto standard last 15 years+ )
82% -3 dB ( half power )
67% -6 dB 1 V output ( quarter power , 1/2 sound- or acoustic power )
52% -10 dB ( 1/10th power , half perceived volume- or loudness )
45% -12...