MIDI In is passed through to the synth, and a CC on the channel above moves every slot assigned to it. Drag from an output (right) to an input (left) to connect. Drag a connected input away to unplug it; click a wire and press Delete to remove it. An unplugged parameter reads its own control slot. Drag the background to pan, wheel to zoom.
A module sees this sample's output only from modules above it; from itself or below, it gets last sample's.