code: def midi2freq(midi_number, tuningA4=440):
      """
      Given a MIDI pitch number, returns its frequency in Hz.
      """
      MIDI_A4 = 69
      return tuningA4 * 2 ** ((midi_number - MIDI_A4) * (1.0 / 12.0))
  
file_path: TimeSide/timeside/plugins/analyzer/externals/vamp_constantq.py
imports: from timeside.core import implements, interfacedoc
  from timeside.core.api import IAnalyzer
  from timeside.core.tools.parameters import HasTraits
  from timeside.core.tools.parameters import store_parameters
  import vamp
  import vampyhost
  from .vampyhost_wrapper import VampAnalyzer
  import numpy
  from timeside.core.grapher import DisplayAnalyzer
label_desc: Use image node_id 1 for calling a global function with example usage: midi2freq(midi_number, tuningA4) and returns: unknown