   < possible p12 functions :
* f52 0 65 7 0 32 1. 32 0;   < linear: p9->p10->p9  the default
* f50 0 65 7 0 64 1.;            < linear: p9->p10
* f60 0 65 5 .01 64 1.;	         < exponential: p9->p10->p9 
* f62 0 65 5 .01 32 1. 32 .01;   < exponential pyramid :p9->p10->p9
* f54 0 65 9 .25 1 0;	         < 1st quarter of sine wave p9->p10
* f55 0 65 9 .5 1 0;	         < 1st half of sine wave p9->p10->p9
 <  optional functions if tables used: f98 = table of soundin. numbers,
 < f99 = table of durations ; to use, remove comments, edit & complete
< *f98 0 size -2 soundin.numbers
< *f99 0 size -2 durations

SFPAN                     < mono input; 2 channel pan output   
p3  
du  
     < p4 = soundin.#, or, if negative, index to function tables 98 & 99
p4 
  < OPTIONAL p-fields (p5 - p8): p5 = amplitude multiplier
p5      
  < p6 = duration skipped from front of soundfile
p6  
  <  p7 = fade-in time : if negative or between 100.0 & 101. = % p3
p7   
  <  p8 = fade-out time : if negative or between 100.0 & 101. = % p3
p8   

< pan between a1 (left channel) and a2 (right channel)
 < p9 = 1st decimal % to LC [0 - 1. ]
p9    
 < p10 = 2nd decimal % to LC [0 - 1. ]
p10  
< p11 = Rate of change: 0 = 1/p3; >100 = (val.-100)/p3 ; negative = actual dur.
p11    
  < p12 = function number for change between p9 & p10 : default = f52
p12     
p13                                 < starting phase for this function (0 -1.)
