1. School of Music, University of Illinois Urbana Champaign 1 , Champaign, Illinois 61820, USA
2. School of Graduate and Professional Studies, Delaware Valley University 2 , Doylestown, Pennsylvania 18901, USA
3. Department of Industrial Engineering, University of Bologna 3 , Bologna 40136, Italy
4. Department of Speech and Hearing Science, University of Illinois Urbana Champaign 4 , Champaign, Illinois 61820, USA