you're very welcome.

I'm still not clear what the exact problem is whether the right hand voice or the balance in the accompaniment... but you could try this:

1 Initialise the 7k
2 choose 16Bt standard
3 press and hold one touch play
4 the split point should be C3 as seen on the keyboard (middle led)
5 choose fantasia as the R1 voice
6 don't start the rhythm
7 play C3 to C4 as seen on keyboard and the sound will be too low, this is normal because you can easily run out of notes playing this far down
8 play C4 to C5, this is a more natural range for this voice and is the intended playing area
9 switch off APC and the voice moves down the keyboard an octave, ie the same keys play an octave higher.

this is a design intention and does not constitute a fault. APC will shift the octave of the right hand automatically on some voices to make the pitch in the playing area more useful, it depends on the setup and voice chosen. If the R1 voice is too low and you want to play in that area of keyboard that is what the R1/R2 octave shift is for.