It is not possible to use the Yamaha on-line broadcast facility
to control anything other than a Disklavier Mark 4, Disklavier E3
and, lately, the DKV850, which is a retrofit controller for some
earlier Disklavier ranges. The server links the specific instrument
to a customer's account, which is not possible on other instruments.
The live data stream cannot be recorded (presumably for reasons
relating to copyright), although there is a facility to buy and
download some of the songs streamed to the piano, some of which
might then be available for copying or transcribing into Standard
MIDI File format (many Yamaha PianoSoft titles are copy protected).