You could try to setup the internal pull down resistors in the rpi. The crack noise is likely the amp powering down. Many cheap amps don't have the extra hardware to deal with the power/up/down with out a crackle.
This is from the hifiberry site, make sure you are correctly interpreting gpio. What pins on the 40 pin header are you connecting to > > HIFIBERRY MINIAMP > GPIOs 18-21 (pins 12, 35, 38 and 40) are used for the sound interface. > GPIO16 can be used to mute the power stage. GPIO26 shuts down the power > stage. You cant use these GPIOs for any other purpose. piCorePlayer a small player for the Raspberry Pi in RAM. Homepage: https://www.picoreplayer.org Please 'donate' (https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=U7JHY5WYHCNRU&lc=GB¤cy_code=USD&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted) if you like the piCorePlayer ------------------------------------------------------------------------ paul-'s Profile: http://forums.slimdevices.com/member.php?userid=58858 View this thread: http://forums.slimdevices.com/showthread.php?t=109769
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