posted 30 March 2009 12:07            

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If I put a -1 in the freqoffset field of a spectrum modify , is that inverting the frequency? ie. lows become highs and highs become lows?

How can I invert the amps too?

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posted 30 March 2009 13:22            

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To invert the spectrum, use a -1 in the FreqScale field of the SpectrumModifier. This reverses the ascending order of the frequencies. For example, if your spectrum were 100 200 300 400, this would change it to -400 -300 -200 -100. Next put a fader in the FreqOffset field to shift those negative frequencies upward until they are above zero. In this way, you will have reversed the order of the partials and inverted the spectrum.

Note that it tends to be more interesting to select a specific range of frequencies or tracks to invert. If you invert the entire spectrum, you can get some very loud, very high and very noisy partials up at the top.

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posted 30 March 2009 16:49            

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excellent, thanks!

what about the amps?

i'm wary of experimenting with them in the modifier, because I have DSP blow ups in the past....

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posted 30 March 2009 18:01            

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Effectively this is already inverting the amps. For example if your spectrum freq|amp pairs were:
100|1, 200|0.5, 300|0.33

Negating the frequencies gives you:
-300|0.33, -200|0.5, -100|1

Adding 400 to all the frequencies gives you:
100|0.33, 200|0.5, 300|1

Now the smaller amplitudes are on the lower frequencies and the larger amplitudes are with the higher frequencies.

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