RECORD1234GUIDE TRACK1234MASTERMONITORRECORDPLAY11223344HEADPHONESGUIDE TRACKMONITOR⇇⇉♪STOP≈7.515○●00001 DRY2 COPYLCRLCRPHASE1800OUTdBOUTPUTLEVELSPOOLRECORDING LEVELREVFWDLINE OUTPLAYBACKSPOOLMETERMONITOR15203040506080100150R.C. OSCILLATORRANGEVOLTSATTENUATORSQUARESINEOUTPUT
The same moment of the vocal on each tape: the gap between them is the delayMachine 1 feeds machine 2 from its record head; the dry comes from its play headArtificial double tracking (ADT) plays a copy of a voice a few milliseconds late, so one take sounds like two. Machine 2 records the vocal and replays it; the oscillator sets its speed, and so the gap. Flanging drags the gap through zero by hand. Watch is 1/8 speed.

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