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The transposer Hauptwerk has a transposer, which adds to or subtracts from the note numbers of incoming MIDI messages. It thus enables you to hear pieces of music in keys other than that in which you play them, which may be useful if you wish to accompany singers but do not wish to transpose by sight, for example. Note that the transposer only raises or lowers the pitch of what you play by whole note increments, and that the playback pitch of the virtual pipes is not altered in any way, since the increment is applied at the incoming MIDI note message level. Thus if you play a bottom C note with the transposer set to +1, Hauptwerk will actually make the bottom C# pipe sound. Bear this in mind, since it can mean that keys at the ends of the keyboard no longer sound pipes when the transposer is used. However, by incrementing the note number rather than adjusting the playback pitch of the pipes, the pipes continue to sound absolutely natural, and any real external pipework or voice modules being driven by Hauptwerk will automatically be affected equally. The Transposer affects this path? setting on the General settings | MIDI input paths screen is used to prevent the transposer affecting MIDI input paths which are used for switch MIDI inputs:
Note that for this reason, you may prefer not to mix MIDI keys and MIDI control switches on a single MIDI encoder, where the setting would affect the whole MIDI channel. The Functions | Clear transposer menu option turns off the transposer (the default). Functions | Increment/Decrement transposer by one semitone options adjust its setting relative to its current value, and can be triggered by MIDI if required:
The current increment applied by the transposer is shown in the status bar at the bottom of the main window:
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