Like LFClipNoise, it generates the values -1 or +1 at a rate given by the freq argument, with two differences:
If you don't need very high or very low freqs, or use fixed freqs, LFDClipNoise is more efficient.
| freq | 
 Approximate rate at which to generate random values.  | 
| mul | 
 Output will be multiplied by this value.  | 
| add | 
 This value will be added to the output.  | 
freq argument only when scheduled; thus they often seem to hang when freqs get very low.