Commit cf31e89 by @SimonZimmer has introduced the AudioFileSpecSet class instead of the old AudioSpecSet class. However this change was not refleced within /loudness_processing/align_waveform_to_target.py which was still using the old AudioSpecSet class.
Commit cf31e89 by @SimonZimmer has introduced the AudioFileSpecSet class instead of the old AudioSpecSet class. However this change was not refleced within /loudness_processing/align_waveform_to_target.py which was still using the old AudioSpecSet class.