Using the Drain Plugs to achieve different playing styles on a WX7

During normal use (without plugs), the WX7 behaves like a regular saxophone, meaning the air passes down the body of the instrument and out the lower Drain Hole.

There are two types of Drain Plugs that were originally included with the WX7:
1) Partially blocking the Drain Hole (with a cross-shaped cross section).

2) Fully blocking the Drain Hole (with a circular cross-section).
Partially closing the upper Drain Hole, creates a tight blowing feel, while completely closing the upper Drain Hole creates an even tighter feel, suitable for saxophone players who tend to blow with greater force. Inserting Drain Plugs

1) Detach the mouthpiece by gently, but firmly sliding it out from the top of the WX7.

2) Insert the Drain plug into the slot as far as it will comfortably go.
CAUTION: Take care not to touch the thin Lip Sensor extending from the instrument. This device measures subtle variations in lip pressure and can be easily bent or damaged.

NOTE: Drain Plugs were originally included with the WX7, however, they are no longer an inventoried item at Yamaha.

Reference: Owner's Manual, p.6