This bit uses Bitwig's Grid to draw a clear line between the two fundamental types of modulation signals: envelopes and LFOs. An envelope is aperiodic, meaning it only fires when a note triggers it, runs its course, and stops. An LFO is periodic, running continuously on its own repeating cycle regardless of what notes are playing.
An oscilloscope is patched in to make this distinction visible, not just audible. Seeing the LFO output moving constantly while the AD envelope sits flat until triggered makes the conceptual difference immediately concrete.
This is the foundation for understanding modular patching more broadly. Once you know whether a signal is periodic or aperiodic, you can make smarter decisions about what to route where and why.