[chuck-users] adsr

[eduard aylon]

Hi all,

I am testing how ADSR UGen works and I am still not sure what do  
parameters to (time)members (attackTime, decayTime, etc) mean. Are  
they automatically casted to seconds?
For instance:

ADSR env;
env.attackTime( .1 );

Does this mean that attackTime is 100::ms?


I have tried to understand how ADSR works with the following patch:


sinosc s => ADSR env => dac;

env.attackTime( .01 );
env.releaseTime( 1 );
env.decayTime( 0 );

1=>env.keyOn;
<<< "begin note_on", env.state(), now/ms>>>;
while( !env.state() )
{
     1::samp=>now;
     if( env.state() )
         <<< "end_of_attack", env.state(), now/ms>>>;
}
1=>env.keyOff;
<<< "begin note_off", env.state(), now/ms>>>;
while( env.state() == 1 )
{
     1::samp=>now;
}
<<< "end_of_decay", env.state(), now/ms>>>;
while( env.state() == 2 )
{
     1::samp=>now;
}
<<< "end_of_sustain", env.state(), now/ms>>>;
while( env.state() == 3 )
{
     1::samp=>now;
}
<<< "end_of_release", env.state(), now/ms>>>;
while( env.state() != 4 )
{
     1::samp=>now;
}
<<< "done.", env.state(), now/ms>>>;


which ouput is the following:

begin note_on 0 0.000000
end_of_attack 1 10.000000
begin note_off 3 10.000000
end_of_decay 3 10.000000
end_of_sustain 3 10.000000
end_of_release 4 2010.000000
done. 4 2010.000000


This would bean that attack lasts for 10::ms as env.attackTime() was  
set to .01. But then I don't understand why release ends at 2010::ms  
as releaseTime() is set to 1.
Note that decayTime is set to zero and there is no sustain, as you  
can see from the output.
Can anybody give me a hand on how to interpret the parameters to ADSR  
members?

Thanks,

eduard