Mains noise

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Interestingly enough the new Original d'Atelier features a new power filter board:

A new power filter input board has been developed. 

It is based on a new conduction EMI (electromagnetic interference) filter. Have fewer, but better performance of the magnetic element, the use of new high-quality alloy made. This improvement has laid the ability to filter unwanted signal ground power. Original d'Atelier is more separated from the main network power supply noise than ever.

 Guillaume

This would seem to address some of the issues of incoming power but I guess the problem of injected noise back into the supply remains ( ? )