COUPLER. All modern organs are provided with mechanical appliances called ‘couplers.
’ These useful adjuncts are of two general kinds— ‘manual couplers
’ and ‘pedal couplers.
’ (1) The former operate in one of three ways: either by taking down on one manual the key corresponding to that played on another, in which case it is a ‘unison coupler
’; or by taking down the octave above the note pressed down, when it forms an ‘octave coupler,
’ sometimes incorrectly called...
