Create a new song (for multiplayer live performances)
Create patterns & tweak presets on multiple browser tabs (please allow pop-ups)
1) Clicking on "Create patterns" button will open each instrument of a multiplayer setup on a Web browser tab (provided you allowed pop-ups for this domain).
2) From the blank state of each instrument you may save pattern sequences and tone/sound settings by clicking the corresponding "save" green buton.
...Loops - recreating drum & bassline parts of Mr Fingers - Can You Feel It (Youtube video tutorial)