Abstract: A disk mastering preview system utilizes an original audio signal from an audio source for previewing signals to be recorded by a disk lathe. Delayed audio signals corresponding to the original audio signals are produced for recording by the disk lathe a predetermined time delay thereafter. The original audio signals are sampled periodically by a sample and hold circuit to produce analog sample signals indicative of the signals sampled. An analog to digital converter converts the analog sample signals to corresponding digital sample signals. Successive digital sample signals are written into successively addressed memory locations and read out an adjustable predetermined number of memory addresses subsequently. A digital to analog converter converts the digital sample signals read out of memory into analog signals for recording. The predetermined number of addresses is set in a time delay register which produces a signal indicative of the number.