Here is the problem: We want to crossfade between two sampled sounds(i.e 
soft rain and hard rain) , but be able to control the fade-in and fade-out of
each sample in realtime.  

Ultimately, the objective is to have a large data set be the controlling 
factor of the crossfades. AS the data changes it should effect the sample 
sound.

Is there a way in csound to change the amplitude of a sound while it is 
playing in real-time by issueing individual amplitude commands without 
having to restart the sound.

thanx,  John Beahan