Spectral Analysis - ULF/VLF Sferics

Load an audio file (local or from a URL) to analyse its spectrogram. Files must be in MP3, WAV, OGG, FLAC, M4A, AAC, OPUS or WEBM format. For external URLs, the server must allow CORS. If it doesn't work, download the file locally instead, for example: specialcollections_sferics-01_23_2018.mp3. From 2 minutes in, it's a real show!