If you describe what makes such a disaster, it could be fixed; two things that come to mind are:
Decorrelation when listening in mono; your digital piano is quite wide even on the lower frequencies, you could try narrowing the lower end with GStereo by GVST or any similar stereo imager.
Trouble in reproducing lower frequencies; if the low end sounds too weak, try adding some saturation in 2x/3x the frequency range of the bass notes, or use harmonic enhancers for the same purpose (Rakarrack Exciter, Steve Harris' Harmonic generator, CALF Exciter...).
If you describe what makes such a disaster, it could be fixed; two things that come to mind are: