If you adjust the spectrum profile on the first page of the Standard- or Pro version, you affect the entire piano globally. If you have PRO, then you can adjust each harmonic individually, on a note-per-note basis.
A little primer on harmonics:
If you are familiar at all with Hammond organs' drawbars, the first of the two white drawbars represents the fundamental frequency or first harmonic of a given note. Interestingly, and intentionally, all of the octave harmonic'd drawbars are white in Hammond organs. These represent the first, second, fourth and eighth harmonic, and each represent the next-higher octave overtones of a given note.
(It turns out that the 1st, 2nd, 4th, 8th, 16th and 32nd harmonic of Pianoteq also corresponds to overtones that sound at a given octave away from the fundamental tone.) Try this little experiment, yourself, with Pianoteq: In Standard or Pro versions, on the opening screen, proceed to minimize all eight harmonics, by sliding them down to their minimum values, one-at-a-time, with your mouse or touch pad. Then raise ONLY the first harmonic to its maximum value (leaving all of the rest at their minimum values), and play Middle C or arpeggiate a C major chord. You will hear essentially a sine wave of the given not being played.
Now, reducing the first harmonic slider to its normal (+0dB) level, proceed to raise the second harmonic slider to its +15dB maximum level and play some single notes. You will hear the original note, plus a second note sounding an octave higher.
Now, re-set the 2nd Harmonic slider to -15dB, and raise the FOURTH harmonic to its maximum +15dB level (keeping the very first harmonic slider at its normal 0dB position). You will hear the original note, plus a second note sounding TWO OCTAVES higher. If you repeat this exercise by maximizing the 8th harmonic slider, you will hear the original note plus a second note THREE OCTAVES higher.
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So much for the even harmonics, 2, 4 and 8, which give rise to harmonics sounding one, two and three octaves higher than the original note.
Let's play with the ODD harmonics:
Keeping the first harmonic slider at 0dB, proceed to maximize ONLY the 3rd harmonic slider. Now if you are playing middle C on your keyboard, you should hear that same middle C, in conjunction with a G sounding 1-1/2 octaves higher than the original C. If you continue and play with the 5th, 6th and 7th harmonic sliders individually, you will hear the other harmonics that correspond to these particular sliders.
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Here's the clincher with brittle sounding high notes: You only need to adjust (reduce) the 2nd, 3rd or 4th slider, only about -2 or -3 dB to effect the brittleness of very high notes. Why? That's because these are about the only harmonics you are going to hear anyway in the highest octave of a piano. Restated, the highest C on a normal piano has a fundamental frequency only about 4000Hz, so anything beyond the third or fourth harmonic isn't going to be heard (or reproduced) anyway.
Enough of my rambling; you get the picture of what to do.
Hope this helps explain the spectrum profiles.
Cheers,
Joe
Last edited by jcfelice88keys (21-10-2017 21:04)