[PD] fluid~ generator attack time

[info at hansroels.be]

Hello,

This is a simple question about the fluid~ external. According to the 
documentation on this site 
http://www.pjb.com.au/midi/sfspec21.html#8.1.1 I should send values to 
generator 34 to change the attack time of the amplitude envelope, for 
example a message with value 0 should result in an attack time of 1 second:

[gen 1 34 0(

But this doesn't produce any change in the attack. (other generators, 
for example 52 -fine tuning-, work well). Am I misunderstanding 
something about soundfonts and generators?

I am using Pd-l2ork version 2.0 (20170207-rev.a243cb3) on Linux mint, I 
am using these sf2 soundfonts : Timbres Of Heaven GM_GS_XG_SFX V 3.4 
Final  and GeneralUser GS SoftSynth v1.44

best, Hans
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