Sony NYSNO-10 Help Manual page 28

You hear voice guidance indicating the group registration is started.
When you hear voice guidance indicating the group registration is completed on all main units to register as a
group, the registration is completed.
Hint
If you press the TALK buttons on two or more remote controls in step
registrations may fail. If you hear voice guidance indicating registration failure in step
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, or the radio wave condition is not good, the group
, repeat from step .