< functions are needed for p fields 7 and 12 : the most common functions are :
 * f50 0 65 7 0 64 1.;           < linear change from value 1 to value 2
 * f60 0 65 5 .01 64 1.;         < exponential change from value 1 to value 2
 * f52 0 65 7 0 32 1. 32 0;      < linear change from value 1 to val 2 to val 1
 * f62 0 65 5 .01 32 1. 32 .01;  < expo. change from value 1 to value 2 to val 1

REV 0 0 1;
p3  
   < Variable reverb time :
p4         < 1st rev. time [normal range: .2 - 2. ]
p5         < 2nd rev. time [normal range: .2 - 2. ]
<p6 = rate of change; 0=1/p3; >100=(val-100)/p3; neg.=actual dur. in seconds
p6  
p7         < function number for change : default = f52
p8         < optional starting phase
< % of direct & reverb signal varies:
p9         < 1st decimal % to reverb [normal range: .1 - .75 ]
p10        < 2nd decimal % to reverb [normal range: .1 - .75 ]
<p11 = rate of change; 0=1/p3; >100=(val-100)/p3; neg.=actual dur. in seconds
p11  
p12        < function number for change : default = f52
p13        < optional starting phase
