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Pyramix v10 project containing the new Buses layout/Structure cannot be saved within a Save Special v9.0 project as warning message will prevent you from doing so.
Mono Legacy Bus conversion
Legacy Bus conversions. Due to the architecture of the new busses, mono mix busses are now converted into Mono Aux busses and not anymore to Mono Mix busses as Mix busses have no gain control.
Controller EMC - Legacy and new Aux bus / Subgroups
When using an OASIS-EMC controller (HUI fro example), you can use a mixer that contains both legacy and V10 Aux and subgroups, but you will not be able to control both the legacy and the V10 Aux and Subgroups from the controller, the controller is only able to handle one bus type at a time; therefore merging recommends you convert your legacy Aux and Subgroups to V10 busses.