I’ve recently installed the HALion Symphonic Orchestra. The double-bass virtual keyboard has C1 has its lowest playable key, but it actually sounds an octave lower - C0. Is there any particular reason why this should be so, and can I do anything about it apart from entering notes an octave higher in the key editor?
The contrabass/double bass in almost all orchestral libraries will be transposed by an octave. This makes it easier to reuse the notes played by other instruments such as the cellos, bassoon and french horns (which is transposed one octave lower).