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Today's lesson gives a complete explanation of drone reeds and how they work at different pressures. Why do drones shut off with too much pressure? Why do some drones squeal on the strike in? What causes a bass drone to howl or roar? What is the double tone and why do pipers look for that in a drone reed? This graphic shows how changes in pressure will affect the drone reed and how it sounds:   Watch the 10 minute video for more detail: In general, as you adjust the bridle of the drone reed it will affect the pressure level for each phase.  For example, if you open up the drone reed (by sliding the bridle towards the base of the reed) you will increase the air pressure required to (1) produce the first tone and (2) the second tone, and (3) to make the reed shut off.  On the other hand if you ...