Masks off bits in the mantissa of the floating point sample value. This introduces a quantization noise, but is less severe than linearly quantizing the signal.
| in | 
 The input signal.  | 
| bits | 
 The number of mantissa bits to preserve. A number from 0 to 23.  | 
| mul | 
 Output will be multiplied by this value.  | 
| add | 
 This value will be added to the output.  |