As discussed in the first chapter, optimal adjustment of most pad-closure screws is achieved through the use of playing tests. Most of these tests involve slurring very slowly and with light finger pressure from a higher note to a lower note. If the relevant screw is not adjusted optimally, the slur may not be clean: it may generate either a ‘hitch’ or a ‘wooze’ (see p. 15).
To help the player recognize and distinguish the two sounds, the attached audio files offer examples of each.
Each is coupled with examples of how the same slur on the same instrument sounded after the relevant screw was adjusted to eliminate the hitch or wooze.