Connecting the T4 and another keyboard X.
I do not known anything about the G70, but I have connected other keyboards to the T4.
Make sure that the X keyboard transmits on channel 1, and that it use the MIDI interface.
Connect with MIDI cables: The the MIDI output of X to T4 Midi In A.
On the T4:
Function > Midi
Preset: Midi Off
Edit
Tab: Chord Detect
Check Midi A / USB channel 1
You may want to save these MIDI settings, for easy recall.
Exit
Tab: User
Save: Enter name
With this, channel 1 events on the X keyboard will trigger the style/chord part of the T4.
You may want to split the X keyboard, such only part of it triggers channel 1 output.
--kurt