(1) In tape recording, the process of adjusting all parameters of the position and orientation of the tape heads and guides with respect to the tape path.

See azimuth.

(2) The adjustment or calibration of any parameter of an electronic circuit or device, e.g., program levelbias level, to bring this parameter into conformance with an industry standard.

(3) The process of matching mixer and recorder meters so that only one meter needs to be watched during recording. When the mixer and (analog) recorder are both peaking about 0VU, this minimizes the noise and distortion in both units. Ideally, both units would be matched with a steady tone (the C or B two octaves above middle-C, or about 2kHz, for example.)

See line-up tone.