Re: [fluid-dev] initialFilterFC question

[Josh Green]

On Mon, 2004-07-26 at 03:40, Antoine Schmitt wrote:
> Hi fluid-devels,
> a user of the fluidXtra, built on fluidsynth v1.0.3 (last year) 
> reports that changing the value of the generator 8 (initialFilterFc) 
> does not affect the signal. The signal is only affected when for 
> example a modulator that affects the FilterCutoff is also changed, 
> like modLfoToFilterFc (generator 10).
> He says that other soundfont editors allow for filterCutoff tuning. 
> And checking the SF2.1 specs seems to point this way too. On the 
> other hand, the default values for the initialFC is specified to be 
> 13500, which would mean that the filter affects the signal by 
> default, which would be a strange idea. Finally, actually polling the 
> initial value of the initialFC returns 1500 instead of 13500.
> Could someone shed some light of this issue for me ? I looked around 
> in the code, but got a bit lost. So I don't know if this is a special 
> interpretation of the SF2.1 specs, a bug in version 1.0.3 that has 
> been corrected now, a misunderstanding on my side (and my user's) of 
> the SF2.1 specs, or something that I should do at a client level (in 
> the Xtra) to ask the synth to take generator 8 into account.
> Thanks !

How are you changing the initialFilterFc parameter? Or to re-phrase,
what FluidSynth functions are you using? This control works fine in real
time via Swami, but I'm using fluid_voice_gen_set followed by
fluid_voice_update_param. Cheers.
        Josh