.SLX File Extension
What is an SLX file?
Audio project created by SpectraLayers Pro, an advanced audio spectrum editor; may contain multiple sound layers with independent edits and filters for each layer; allows standard audio files to be unmixed so that sounds can be isolated and edited; used by sound engineers and audio-video editors.
SpectraLayers Pro also saves projects using the .SLP extension. SpectraLayers Pro was developed by Sony until it was sold to MAGIX in 2016.