A new modul introduced by HDB Vermona in Erlbach / Germany is TAI-4.
The TRANSFORMER ISOLATED AUDIO  INTERFACE offers two indipendent Inputs and Outputs to interface gear with symmetric I/O’s.
Level-adjustment thru switches to provide identical settings on all of the channels when used for stereo applications.
The modul sells at 289,-€ and weights 340 gramms due to transformers on backside.