Your virtual drum double to play along with. Program a groove, pick your view (face to face like a mirror, or first person) and drum along at your own tempo.
Click a cell to place a hit. Click again for an accent (higher stroke), again for a ghost note (soft, dotted), and once more to clear it. On the crash, ride and hi-hat there is one extra step: the bell (filled circle), where the stick hits the dome in the middle of the cymbal. The letter R or L shows which hand the drummer uses. Want a different sticking? Pick Choose hand and click a hit to swap R and L. Fills sets which hand leads a roll. Switch off Drum audio and turn on the metronome to play everything yourself. Import score loads a whole drum part from MusicXML (.musicxml, .xml, .mxl), or from a PDF or photo when the site runs omr.php with Audiveris; it then plays bar by bar. Drummer model: Universal Animation Library by Quaternius (CC0). Acoustic drum sounds: The Open Source Drum Kit by Real Music Media (public domain).