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
file.
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.
-~Chris
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