From james_eaton@btopenworld.com Thu Feb 18 02:03:48 2010
Subject:Re: Roland VK-7 Opinions Sought - Am I Going to Like It?

From owner's manual P117 (although it stops short of saying explicitly that it is pin 11 that is used to switch the internal Leslie effect on or off but that is how it works. Also I found that even 9v DC would be enough to cause the effect to be disabled):

"Pin No. 11 detects the connection. If the voltage is not within the range specified for the rated input voltage (18 to 30V DC), it will not function correctly.

The volume of the rotary speaker is adjusted by the ROTARY LEVEL knob located on the rear panel.

When a rotary speaker is connected, the rotary effect (p.27) built into the VK-7 will not function.
The ROTARY SOUND [FAST/SLOW] switch the rotational speed of the connected rotary speaker.
[BYPASS] does not affect the rotary speaker connected to the VK-7.
* It is not possible to switch the rotary speaker on/off using [BRAKE].
The audio signal output routings when a rotary speaker is connected or disconnected are as follows etc etc

Cheers
James