The last five bars of the Organ piece “Harmonies du soir” (S. Karg-Elert op. 72, reprinted from [30]) demonstrates the three different tone families of the pipe organ (indicated by colour bars) paired with their Celestes as well as several tuning options in (4). Yellow: Violin + Violin Celeste (tuned sharp), first green range: Horn Diapason + Horn Diapason Celeste (tuned sharp), blue: Quintadena Celeste (tuned flat) + Concert Flute Celeste (tuned sharp), final bar (green): Dulciana + Unda Maris (tuned flat). The tuning of the Violin Celeste is adjusted to type d) with +2.1 Hz at A₄, while the two Flute ranks (blue) are tuned to type d) with –1.4 Hz and +1.4 Hz at A₄, yielding 2.8 Hz beat frequency when used together without a rank tuned to unison pitch. The “green” Celestes ranks could not be retuned, but their beat frequency is about 2 Hz and more or less constant with pitch. The recorded sounds are part of the virtual pipe organ sample set “Paramount 450” (see [7] for details).