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Re: [fluid-dev] SoundFont exclusiveClass

From: S. Christian Collins
Subject: Re: [fluid-dev] SoundFont exclusiveClass
Date: Mon, 12 Sep 2016 08:32:50 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 09/12/2016 08:13 AM, Dan Eble wrote:
Say I have an instrument with a release time of 2 seconds.  Fluidsynth sounds 
as if it is playing the sound at constant volume for 2 seconds after the end of 
the note, then stopping abruptly.  According to the SoundFont spec, the volume 
should instead decrease linearly to zero.
I have been working with FluidSynth for years and have never encountered this 
issue. Do you have a SoundFont that exhibits this problem that you could share?
Here’s a simplified version.  The instrument I’m having trouble with is 
supposed to give the impression of the sympathetic resonance of a cello string 
when another string is bowed.  It’s called “Vc, Bowed Symp. 4” in the attached 

The problem isn't the envelope, it's the excessive amount of filter Q you are using on that layer. What appears to be happening is that the 96 dB of resonance amplifies the resonant frequency to a super-high level, which seems to be getting capped by a built-in limiter. Because the resonant level is so high, the limited audio level sounds flat. Since a voice at its quietest envelope point will receive 96 dB of attenuation according to the SF spec, the voice is essentially 100% amplified until it is cut off (which is why you hear a click).

So, if you reduce the filter Q level, you will begin to hear the proper release phase.


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