What are some alternatives?
When comparing SoX and DarkWave Studio, you can also consider the following products
Amadeus Pro - #
Free Audio Editor - Free Audio Editor is a sound editor program for Windows.
WaveShop - Open source audio editor
SampleTank - THE MASTER-QUALITY MIDI SOUND MODULE AND GROOVE WORKSTATION FOR THE MOBILE ARTIST.
Zynewave Podium - Podium is a modern digital audio workstation (DAW) for Windows.
Spectro - Spectro is a freeware audio file analyzer for windows.