I just got an original MIJ TS9 with the JRC4558D chip. Compared to my Keeley modded TS9 RI with the TI chip, the original sounds smoother and has more of a singing quality, a little "darker" perhaps also. The Keeley mod has a little more bass and a little more drive, but the overall tone is not as sweet.
My question to you is: How do these original TS9s compare to either the original 808s which used the same chip, the RI 808s, and your 808 mod?
Can you mod Keely's pedal to sound sweeter while keeping the bass and drive?