I am not very experienced in linux and have this problem with microphone which works fine on Windows. Microphone is external one and when listening to recorded sound (both Sound Recorder and Skype Echo Test) you can hear crackling noise.
I fixed output crackling by replacing
load-module module-hal-detect tsched=0
in /etc/pulse/default.pa but I have no idea how to fix input.
Card: HDA ATI SB Chip: Realtek ALC272X
Thanks for help!