So, after a full installation, running "install.command" in ALCPlugFix and rebooting, the sound is perfectly reproduced from the speakers, but doesn't work when the headset is inserted into the 3.5 mm combo jack.
UPD: If changing the value to 16 for some reason didn't help in your case, try the following values one by one: 3, 11, 13, 15, 16, 54, 99 (it's all possible ones for Realtek ALC236)
So, after a full installation, running "install.command" in ALCPlugFix and rebooting, the sound is perfectly reproduced from the speakers, but doesn't work when the headset is inserted into the 3.5 mm combo jack.
After some investigating I found that this value should be changed from "54" to "16" and then after rebooting all will be fine: https://github.com/daggeryu/DELL-Inspiron_5488_5480_5580_5482_5582_Hackintosh/blob/1b8c4a02523ae3850b3ce672e726251dd5066752/EFI_CLOVER/CLOVER/config.plist#L244
UPD: If changing the value to 16 for some reason didn't help in your case, try the following values one by one: 3, 11, 13, 15, 16, 54, 99 (it's all possible ones for Realtek ALC236)