| 摘要 |
The housing (1'), which is fitted removably to e.g. a trumpet (8), holds an array of principal keys (2) esp. for choice of tones or chords, and auxiliary keys (9) for control of particular functions such as syncopation or selection of different stops and timbres. The keyboard is connected by a cable (6) or wireless link to a music installation which can be controlled thereby using the fingers of one hand whilst the other hand operates the valves in the conventional manner.
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