Sam i was going through the Pioneer site and compared few models along with 7950 and most of USB supported HU says:-
USB Control Capability Yes (CD-UB100 Required) for 7950,
Built-In USB for 6950,
USB Control Yes (CD-UB100 Required) for 5950
so this CD-UB100 is another USB adapter unit need to buy to make HU USB compatible isnt it to many things putting around?How u connected 7950 with USB.
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