A drum machine cut into a record. Each ring is an instrument, each of the 16 slices is a sixteenth note, and the record's speed is the tempo. Tap a groove to cut a note, then grab the platter and scratch.
A real record stores sound as a wiggle along the groove. Play it faster and the stylus meets every wiggle sooner, so the frequency rises by the same ratio: a 33 played at 45 sounds 35% higher, about five semitones. Untick "pitch follows" to hear only the tempo change.
Grab the record and the motor lets go. Wherever you push it, the reading bar plays whatever passes underneath, forwards or backwards, at whatever speed your hand moves. Let go and the motor pulls it back up to speed, just like a direct-drive deck with a bit of torque.
Stop cuts the motor, so the platter coasts down and the last notes sag in pitch on the way out. Start spins it back up in about half a second. Your pattern lives in the page address, so a copied link brings back the same record.