Cell grows the target (the controlled pattern by default). Character adds a controllable cell to the target; with none, it makes a new one-cell character and controls it.
wire
spark
tail
Sensors
Motors (step the pattern when sparked; two at once cancel)
pitch
vol
dur
spawn to the
color
IJKL nudge the circuit under the pointer; ctrl+C / X / V copy, cut, paste it (ctrl+shift+V: as a new pattern).
ant rule
facing
color
color
brush 0
Drag to color cells you own (owners and admins); the ground is anyone's. Keys 1-8 pick a swatch, 0 picks Remove.
mic gain 0 dB
The cell under the pointer. Right-click copies its pattern id.