Experimental power reduction as function of the keyboard analysis frequency. 

SH3
      None	   0 %
      4 Hz	 2.8 %
     16 Hz	 2.8 %
     64 Hz	 2.8 %
    256 Hz	20.0 %

SH4
      None	   0 %
      4 Hz	 1.8 %
     16 Hz	 1.8 %
     64 Hz	 1.8 %
    256 Hz	 3.6 %