This amazing voice came through our SB11 spirit box,
as I did a session in the Stillinger girls' room.
The SB11 is very similar to the SB7, except that it will scan
two channels simultaneously. I was using both channels at a
150 millisecond sweep rate (around 7 1/2 audio frequencies per second).
I scanned forward on one channel, and reverse on the other.
The file ends suddenly because at that point I spoke.
Not much else to add - this response speaks for itself!