Mute the "tweedle-ip" tune when VVX or Trio reboot

Has anyone managed to silence the "tweedle-ip" tune the VVX and Trio play on reboot? (It's deafening when the Trio does it!)

All my efforts (e.g. se.pat.misc.welcome, up.welcomeSoundEnabled=”0”, changing “saf.1” to else) have amounted to nought but a headache. (I've performed all my testing on Trio 5.7.1.4095 & VVX 5.8.0.12386).

I'm OK turning disabling it altogether, lowering the volume, or replacing it with something more subtle.

Thanks,

Greig.