In choosing one of these three methods the following points must not be forgotten: a) the register of a particular isolated chord; the soft and weak register of an instrument should not be coupled with the powerful and piercing range of another:
| Overlaying. | Crossing. | Enclosure. |
 | ||
| Oboe too piercing. | Low notes of the flute too weak. | Bassoon too prominent. |
b) In a succession of chords the general progression of parts must be considered; one tone quality should be devoted to the stationary and another to the moving parts:
When chords are in widely-divided four-part harmony notes may be allotted in pairs to two different tone qualities, adhering to the normal order of register:
| Good: | etc. |