There were also observations of transmutation of mercury from long used fluorescent lamps, after all the seminal Nagayoka experiments were also about similar mercury arc system. BTW tiny droplets of mercury formed after sonification are rigid due to surface tension pressure which would explain the appearance of mercury after sonification. People should experiment and replicate more and less speculate.
The mercury in the fluorescent lamp isotope change was balanced by the equal but opposite change to mercury deposited elsewhere in the lamps, resulting in a net zero change, as reported in the original article.
I know nothing about the sonification so I have no comment on that.