First post, by sgard
I ported the oscilloscope view from a player I write over to a plain web page, so tracker modules can be played and watched without installing anything. Drag a file in and it goes - nothing is uploaded, the file is read inside the tab.
Playback is libopenmpt compiled to wasm, so .mod/.s3m/.xm/.it and the usual oddballs work, plus mp3/flac/ogg/wav. It draws one scope per channel, coloured by frequency: green in the bass, amber in the mids, red in the treble. The colour comes from zero-crossing rate mapped over 300-4500 Hz, which read better on tracker material than an FFT band split did.
Free, no account, no ads, nothing to install. I would be glad to hear if it chokes on anything from your collections - odd MED and OKT files are where I expect trouble, and a scanned .UMX would be interesting too.