(used internally by NodeProxy)
for inner workings see jitlib_fading
| name | 
 like in SynthDef. todo: add variants.  | 
| func | 
 like in SynthDef. todo: add variants.  | 
| rates | 
 like in SynthDef. todo: add variants.  | 
| prependArgs | 
 like in SynthDef. todo: add variants.  | 
| makeFadeEnv | 
 if true it constructs a fader envelope and adds controls for gate and fadeTime  | 
| channelOffset | 
 a constant offset that is added to the out number  | 
| chanConstraint | 
 max numChannels for the synthdef. If ugenfunc returns a larger array, it wraps  | 
| rateConstraint | 
 a symbol like \audio, \control or \scalar.  | 
always use OffsetOut, if set to true (default: false)