em... I am writing a program that dynamically change the tempo/rate of several audio channels with Ess.

here is my code:
   for (int i = 0; i < totalAvailable; i++)
   {
     if(channel[i].state == Ess.STOPPED)
     {
               rateshift[i].percent = Ess.calcShift(gTotal[i]);        
               rateshift[i].filter(channel[i]);    
               channel[i].play();        
     }
   }  
where gTotal[i] is a integer array after video tracking

the problem is, the audio playback rate can be increased, but it cannot be decreased. and the rate keeps increasing if rateshift.percent is larger than 1. How to resolve the problem to make it what i want? thanks a lot