This chart shows how to convert decibels into linear amplitudes, with approximate musical dynamics.
dynamic dB linear
pppp 60.00 +-500
ppp 64.04 +-796
pp 68.07 +-1267
p 72.11 +-2016
mp 76.15 +-3208
mf 80.18 +-5107
f 84.22 +-8127
ff 88.26 +-12936
fff 92.29 +-20588
ffff 96.33 +-32768