Your session will be rendered and downloaded as a WAV file (high-quality, no lossy compression). You can convert to MP3 using any free tool (Audacity, ffmpeg, online converter).
Key-J, in one screen
Every key plays a note. Which note depends on
the scale and octave in the left rail. Click any row there to rebind that key.
Load a sequence and every key plays the next note
of it. This is the part people miss. You stop playing pitches and start playing
rhythm, and the melody is already handled — paste a tab into
Tab & Sequence and type anything.
Where it plays. In a browser, only while this
tab has focus; a page cannot read keys outside itself. The desktop app has a
Global Capture switch and plays over every application.
Getting it out.Export WAV renders the
sequence at a tempo. Export Session records what you typed, with your timing.
Save .txt writes the notes as text and pastes straight back in.