Ako već tražiš "na kliznice" onda, obzirom na niže navedenu definiciju za "slider wind-chest" i definiciju za "slider" istog izvora, ne vidim što bi to moglo biti osim "slider wind-chest".

"Slider Chest=This type of wind chest uses a slider to block the holes in the wind chest and prevent the pipes from speaking."
"Slider=This is a long wooden slat which has holes in it that correspond to a rows of holes in the top of the wind chest. It is used in a slider wind chest ."
http://www.ibiblio.org/pipeorgan/Pages/Glossary.html#Slider

"How the sound is produced: (...) In a mechanical action organ, the wind chest where the pipes stand is called a slider chest. And a slider chest means that it uses a long strip of wood called the slider. It has a hole for every note on the keyboard, or in other words, a hole for every pipe in the rank. If you pull the draw knob out, you actually physically move the slider from one side to the other. A series of holes line up so that when you play a note on the keyboard, air can pass from the wind chest below to the pipe above. If you push the stop off, then the slider moves a few inches over to the side and the air can't pass from the air chamber up to the pipe. So in this manner, if you pull on one draw knob, then you turned on one rank of pipes so you have one pipe playing from each note. If you drew two stops, there would be two pipes from each note and of course if, on this organ, you drew 30 stops, you could actually have 30 pipes playing from one note on the keyboard."
http://www.ibiblio.org/pipeorgan/Pages/SoundProduction.html

Evo još jedne definicije: http://www.dolmetsch.com/defss3.htm

http://esm.rochester.edu/organ/academics/stoplists/MAG-full....

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Note added at 2 hrs (2008-05-01 13:48:05 GMT)
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Da ne zaboravim, ovo ti je adresa prilično opsežnog rječnika Music Dictionary, koji bi ti mogao pomoći (sada sam shvatila da nisam baš posebno naglasila, a po linku se baš i ne vidi sadržaj):
Music Dictionary: http://www.dolmetsch.com/defss3.htm