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Those settings are completely different that what the standard setup is. I have no idea what hardware you are using but I would guess your drivers are way to high. 4x microstepping and no pulleys?
We use 32 microstepping and 16tooth pulleys, and higher top speed less acceleration. Lower micro stepping would cause louder movements but not that constant buzzing. The only way I can make that noise is totally over drive my stepper voltage.
Maybe someone with some linuxcnc experience will step in here. But you will need to list all your hardware with specs and electronics as well.