2 adverbs to describe how to sough

Here they passed out of the burned-over area of underbrush and stubs and scuffed through brushless groves of fir and spruce where no grass grew and not a ray of sunshine struck the ground and the wind soughed always mournfully.

Above the hemlocks soughed softly.

2 adverbs to describe how to  sough  - Adverbs for  sough