(1) Usually refers to a small adjustment, synonymous with tweak.
(2) The attenuation control associated with the first stage of amplification in each module of a console, and by which the incoming level of a mic or line input can be lowered. Usually refers to the trimpot on each channel of a mixer used to adjust the incoming signal to set recording levels.
(3) A short section of exposed film, workprint, or magnetic film track that has been cut out of a take and included in an assembly or workprint.