Some features are disabled in mute-mode to make sure you will not accidently save, download or comment on a different jamtrack from the one you are currently hearing. You may either lift the mute-mode to download or interact with the currently displayed remix, or move to the currently playing track with the green GOTO button.
Today my sister gave me her toy melodica Hohner Clarina 12, 30 or more years old. Even though most people thing a melodica is a toy instrument at all, this is not really true. But this IS a toy instrument with 12 colored buttons (see the photo in my gallery).
But it sounds quiet nice, so I had to play it :-)