The KSD file format is used by the Massive software for generating audio clips that have been created by the user through this program. What is a KSD file? Sound file created by Native Instruments Massive, a program (DAW) that enables you to create and edit "massive" sounds such as deep. The KSD audio files are related to Kore 2. KSD file is a NI Kore Sound. What is a KSD file? KSD is a file format used by audio editing software Massive.