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Re: [fluid-dev] Understanding Attenuation

From: S. Christian Collins
Subject: Re: [fluid-dev] Understanding Attenuation
Date: Wed, 28 Sep 2016 23:28:27 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0

Preset/Instrument level attenuation attenuates 0.4 dB for every 1 dB that you specify. The reason for this behavior is compatibility... this is how Creative/E-MU designed their synth engines, and the thousands of SoundFonts out there expect this behavior.


On 09/28/2016 10:04 PM, Dan Eble wrote:
I asked the following question in the Polyphone forum (http://www.polyphone-soundfonts.com/en/forum/soundfonts-help/29-understanding-attenuation) but didn’t get a conclusive answer.

I've created presets in Polyphone using a sine wave sample with 72 dB, 48 dB, and 0 dB attenuation, then rendered a 1-s tone of each (at velocity 127) with Fluidsynth, then put the wav files through Audacity's spectrum analyzer.

The difference in the peaks is only about half as much as the numbers provided to Polyphone, and I don't understand why.  Is this a suitable way to verify the effect of the attenuation parameter?


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