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Audigy 2 ZSbismark bs-1/bs-16 v4.1DLSMusicDevice (Mac)FluidSynth 1.1.6Jeskola XS-1LinuxSampler 2.0.0sfzSynthFont2 v2.0.2.2Timidity++VirtualMIDISynth 1.16.0
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1. volume envelopeattack is linearignores delay valuedecay incorrect
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2. modulation envelopeattack is linearattack is linear
wrong mod. amount		attack is linearignores delay value
attack is linear		attack is linearattack curve
has initial jump		broken / not supported
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3. key number to decayvalues are inverteddecay amount
too exaggerated
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4. key number to holdhold amount
too exaggerated
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5. modulation LFOnot interpreting
values correctly		LFO starts at low
point instead of middle		not interpreting
values correctly
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6. vibrato LFOnot interpreting
values correctly		LFO starts at low
point instead of middle		not interpreting
values correctly
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7. mod wheel to vib LFO
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8. scale tune / root key
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9. filter cutofflow cutoff = 100 Hz,
filter fully open at
8,000 Hz**		cutoff @ 20 Hz = fully
open, 50 Hz and up = correct
(test doesn't check 21-49 Hz)		filter fully open at
3,000 Hz		filter not very strong,
perhaps pole-1?		low cutoff = 100 Hzfilter @ 20,000 Hz
quieter than 17,500 Hz		filter fully open at
8,000 Hz		low cutoff = 100 Hz,
filter fully open at
8,000 Hz**
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10. filter resonancehighest value = 20 dB
regardless of setting		highest value = 25 dB
regardless of setting
no attenuation at higher dB		not interpreting
values correctly		no attenuation at
higher dB		highest value = 25 dB
regardless of setting		no attenuation at
higher dB		highest value = 20 dB
regardless of setting
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11. attenuation amount5 = 2 dB5 = 2 dB5 = 0.5 dB5 = 2 dB5 = 5 dBnot supported5 = 3 dB5 = 2 dB5 = 1.7 dB5 = 2 dB
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12.a: default velocity to attenuation curve
(96 dB concave)		curve a bit too extremeincorrect curveincorrect curveincorrect curve
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12.b: vel-to-atten curve @ 144 dB concave
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12.c: vel-to-atten curve @ 48 dB concave
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12.d: vel-to-atten curve @ 96 dB linear
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12.e: vel-to-atten curve modulator removed
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13.a: default velocity to filter cutoff curve***always has moderate
vel-to-fc curve applied****		vel-to-fc
not supported		no curve by
default***		vel-to-fc
not supported		always has moderate
vel-to-fc curve applied****		vel-to-fc
not supported		vel-to-fc
not supported		vel-to-fc
not supported		vel-to-fc
not supported
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13.b: vel-to-fc custom curve
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14. CC1 (mod wheel) to filter cutoff
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15. sample offsetseems to be using
wrong values?
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16. reverbinstrument reverb not
supported, only CC91		only active when
CC91 = 64 or higher?		instrument reverb not
supported, only CC91		instrument reverb not
supported, only CC91
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17. chorusinstrument chorus not
supported, only CC93		only active when
CC93 = 64 or higher?		instrument chorus not
supported, only CC93
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18. interpolation typehigh qualitylinearlinearhigh qualitylinear??high qualitylinearhigh qualitylinear
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20. exclusive class
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* - values are estimated
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** - the filter doesn't seem to close any further than 100 Hz, regardless if it is set lower. The filter appears to be fully open at 8,000 Hz. There is no
audible difference between filter values 8,000 and 20,000 Hz.
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*** - the Audigy is correct, but the default vel-to-fc modulator is strange, featuring a secondary modulation source (switch) that makes no sense.
FluidSynth is right, in my opinion, to leave a default curve out of their implementation, while allowing custom modulators to function normally.
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**** - correct according to SoundFont 2.04 spec, but may cause compatibility issues with some SoundFonts due to Sound Blaster filters being fully
open at 8,000 Hz. This means that in instruments with high filter cutoff values (11-20 KHz), it is not possible to perceive the filter cutoff changing
with velocity on Sound Blaster hardware. My recommendation to SoundFont synth designers is to ignore the default velocity-to-filter cutoff modulator
altogether. Read more about this here:
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SoundFont Synth Notes and Observations
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