HOW
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In a pipe organ, most builders use flue pipes for the upper octave when building a reed rank. So when sampling a pipe organ for use in a virtual organ it makes sense to sample each note to achieve the "exact" duplicate of the original voicing. However, it is conceivable to build an organ with the reed scaling from note 1 to note 61 without the use of flue pipes. In this case it would seem that a single recording can be used for all 61 notes. The pipe organ is one of the few instruments that has the harmonic (partial) structure that does not necessarily change from C1 to C6. Some high frequency attenuation may be in order though. The older digital Allen Organs use a single sample as do others. I can play 1971 vintage Allen Organ voices (32 words X 8 bit) using Hlabs TWGs and cannot tell the difference between many modern virtual organ voices except for the articulation (attack and release) which is irrelevant when playing ensembles. Other instruments such as orchestral and the like have a variable harmonic structure such that the high notes have different harmonic content than the low notes that are rich in harmonics. In this case all notes must be sampled. All comments welcome.