I found decision in „Command Line Options“ of SqueezeLite Player.
Config located on „Edit Advanced Options“ button in SqueezeLite Player settings.
Look at -G <Rpi GPIO#>:<H/L> – Specify the BCM GPIO# to use for Amp Power Relay and if the output should be Active High or Low
My example of line -G 14:H – 14 Pin High level on Player Power On.
