The audio stimuli for the experiment were generated using the Scaper soundscape synthesis library, and the experiment was carried out using the AudioAnnotator web interface:
Investigating the Effect of Sound-Event Loudness on Crowdsourced Audio Annotations
M. Cartwright, J. Salamon, A. Seals, O. Nov, and J. P. Bello
In IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Calgary, Canada, Apr. 2018.