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There are two definitions of "sample" in TouchDesigner.

In CHOPs, it is a single number, where a sequence of samples makes up a channel.

In the audio world, "sample" often means what in TouchDesigner would be called a channel, or two channels where the audio is in stereo. In TouchDesigner, we refer to it as a CHOP holding two channels with a certain time duration, measured in (Touch-style) samples, seconds or frames.

In the context of TOPs, we sometimes talk of "sampling an image".

An Operator Family which operate on Channels (a series of numbers) which are used for animation, audio, mathematics, simulation, logic, UI construction, and many other applications.