With a conventional transformer (that has a W and B button), press just W-B-B to toggle the conventional mode speed-control. Toggle means off to on, or on to off. The engine will give you a double-toot acknowledge sound. The change will carry-over between operating sessions (it remembers the setting). The button timing can be tricky. Here's a video I made some time back showing a more complex button sequence that performs a factory-reset but gives you an idea of what it takes. You just need W-B-B. Again, listen for the double-toot acknowledge sound from the engine; that tells you the engine properly received the command.
In all cases, when you turn speed-control OFF, the PS3 engine will run FASTER for the same track voltage than with speed-control ON. There is no indicator, status light, sound, or whatever that tells you if speed-control is on or off!
If for whatever reason you get out of sync and don't know where you are (speed control ON or OFF), perform the factory-reset button sequence as shown in the video and listen for the double-toot. This gets you back to the factory-default setting where speed-control is ON.
