The train sounds great actually. I've seen some comments on other sites wondering why the MITRAC propulsion may sound the way it does now compared to previous versions. Here's 3 reasons I can think of:
1) SiC-type inverters are now becoming common. These are more compact compared to the standard IGBT-type inverters, run quieter and have low maintenance costs.
2) Bombardier has started to shift towards Permanent Magnet (PM) type motors over the past 5 years. The MITRAC PM motors have been used in projects, including the S7/S8 trains in London and the C951 trains in Singapore. Here's clips of both where you can hear resemblances.
3) A combination of both technologies may have been used.
My guess personally is more likely a SiC-type inverter was used for this project.
London S7/S8 with PM motors:
https://www.youtube.com/watch?v=G7OqJ_VUdG0" onclick="window.open(this.href);return false;
Singapore C951 with PM motors:
https://www.youtube.com/watch?v=cTspBC-Q9sc" onclick="window.open(this.href);return false;
One thing that many may not remember is that the Bombardier propulsion used in the R142A/143/188 trains was not actually designed by Bombardier. It was designed by AdTranz, which Bombardier acquired from DaimlerChrysler Rail Systems in the early 2000's. Bombardier gained propulsion technology at that time and was able to fast track their own R&D with the new MITRAC system to help get to where it is now.
Gotta love Alstom. Every year on opening day of hunting season, it is a paid holiday!