Hey HN. Thanks again for featuring this project :) this is my favorite community on the internet and my go to site to visit, almost by reflex, when I have idle time, so it feels me with joy to have made something well received here.

I 'll be heading off soon, so decided to write some features included in this release that might not be apparent right away (still working on improving the UX).

- Drag n drop multiple audio files into multitrack = multiple channels automatically created

- Double click on a waveform box in multitrack, opens it in the original audio editor (for more precise editing)

- Copying (command+c, or shift+c) works between multitrack and regular editor. So for example, you can open a file in original editor tweak it, and then copy all or part of it and paste it in multitrack in a specific channel.

- Most effects have already pre-made presets to make them easier to use

- You can make your own effect presets by clicking the 3 dots after having made a modification in an effect (stored in localstorage)

- Zero crossing selection is under "Edit"

- There is a tempo tools section in View. You can automatically detect tempo of a track, tap to guess a tempo and play with metronome

- There is also an id3 tag viewer (for mp3 files) there as well

- You can right click or press M to add markers (makes it easier to highlight sections of a track, especially when working with longer audio tracks)

- Seamless Loop tool (under Edit): crossfade preview, silence trim, repeat loop, open loop in a new editor tab.

- Offline/PWA support: Help > store offline version, will open a new page that will trigger a service worker that will make the site work offline as well.

- Session export as .amss file for multitrack. If you aren't done working on a session you can export all of its audiofiles and configuration in an LZMA compressed container file (will still be pretty big though). For single audio mode, mp3/wav/flac export is available.

- Pressing X in multitrack when 2 waveform boxes overlap, makes them crossfade smoothly (denoted by an "XF" label at the top right - undocumented behavior but can be quite useful, will keep improving it)

- You can open the menu by pressing the ~ key and then navigate it with arrow keys (left/right for sections, bottom up for selections, enter to trigger an action and esc to close) for a tiny bump in speed of getting things done. Similarly the time controls are clickable and open a mini menu where a time can be specified to jump quickly to it (arrow keys to go between minutes/s/ms)

And finally my favorite feature of them all (though not a new one per se),

- In "View" select "Frequency analyzer" or "Multitrack mixer" and then press the dock button. Audiomass supports the ability to extract elements of it into new pop up windows. So you could have parts of the application on a different monitor keeping the main app in the main tab. It's a very old trick, but I find it kinda cool :)

Thanks again and hope you enjoyed the sample music! (edit: formatting)

Show HN: Audiomass – a free, open-source multitrack audio editor for the web