Here’s an MP3 file of the noise the organ is making. It’s about 24 seconds:
- The pop of the power switch being turned on.
- Silence and the noise fading in as the tubes warm up.
- Loud noise.
- Faint notes — me playing on the keyboard. I could adjust the manual and pedal volumes to any mix I wanted; that’s just where they happened to be set.
- Fade out after I turned off the power.
Note that the noise is continuous the whole time the organ is on — not just when playing the keyboard or pedals. And my iBook’s internal microphone didn’t capture the lower octaves of the noise at all — the sputter goes down further than I can hear playing back this sample.
Maybe this helps?