ExtensionShould not use this class but OteyPianoString instead (see example) for having only one soundboard for all strings which is more efficient.
Digital wave guide physical model of a piano wrapping the code provided by Clayton Otey.
It is important to release synth once finished because because it is CPU expensive.
| freq | 
 Sound frequency.  | 
| vel | 
 Key pulsation velocity. Betwen 0 and 1.  | 
| t_gate | 
 Retriggers note, use a TriggerControl for not retriggering continuosly.  | 
| rmin | 
 minimum string radio  | 
| rmax | 
 maximun string radio  | 
| rampl | 
 radius left sigmoidal shape.  | 
| rampr | 
 radius right sigmoidal shape.  | 
| rcore | 
 cord nucleus radio.  | 
| lmin | 
 minimum string length.  | 
| lmax | 
 maximum string length.  | 
| lampl | 
 lenght left sigmoidal shape.  | 
| lampr | 
 lenght right sigmoidal shape.  | 
| rho | 
 string density multiplier.  | 
| e | 
 young modulus multiplier.  | 
| zb | 
 bridge impedance multiplier.  | 
| zh | 
 hammer impedance multiplier.  | 
| mh | 
 mass hammer multiplier.  | 
| k | 
 force hammer multiplier.  | 
| alpha | 
 hysteresys hammer multiplier.  | 
| p | 
 stiffness_exponent_hammer multiplier.  | 
| hpos | 
 hammer position. (0 to 1)  | 
| loss | 
 string loss factor.  | 
| detune | 
 detuning among 3 strings.  | 
| hammer_type | 
 1 is Stulov model, 2 is Banks model.  |