Slide projector #1.m4a

Elmo Omnigraphic 253AF slide projector, similar to a Kodak S-AV 2000. Turn on, slide change at 10 second intervals, turn off. Recorded on a Marantz PMD 661 with a Rode NT4, 250 mm above centre rear of projector, angled down at 45º.

I needed this sound as part of an audio-visual that mimics a slide show. I chose to record a 10-second change interval (instead of a shorter interval) because that allows me to razor the waveform between changes, and then extend (or reduce) the time between changes. Too short a time interval between slide changes means you'd have to add motor/fan sound between every change.