class_docstr: Gain effect processor
code: def id():
      return "fx_gain"
  
file_path: TimeSide/timeside/plugins/fx/gain.py
imports: from timeside.core import Processor, implements, interfacedoc
  from timeside.core.api import IEffect
  import numpy
label_desc: Use image node_id 2 for calling the Gain obj's underlying member method code with example usage: obj.id() and returns: str