Justin, First of all, the unlabeled toggle is for changing the tempo during select passages without changing the general tempo setting for the entire roll. This is sometimes denoted as: accel./retard. Secondly, the disconnected hose will not go to the wind motor (drives the roll as you suspected). The hose for the wind motor will originate at the governor (just right of center with outward pressure external spring). By the angle of the flanged nipple where the disconnected hose is attached, that hose definitely will go upward and to the bass end. You should feel for either a hole in a wood component for the elbow to fit in or another hose for it to connect to. Don't forget to look on the left side of the upper unit or at any pneumatics visible top or bottom at that end. All that being said....I don't think you will have this instrument playing at all even if you can connect that hose. By the "set" the hose has taken, it has been disconnected for a very long time (look at the distortion where it attaches to the flanged elbow). This is an old "rebuild". Not particularly a well done one from what I can see in the photos. Even so, at this point in time many other elements have failed that would not have been addressed when the work was done, such as pouches, valve facings, gaskets, and on and on. Your best bet....go to www.player-care.com , locate a nearby player tech from the listings and give that persons name to your customer. This has no easy or inexpensive fix. Debbie L.
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