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.