I think the a MUSES 8820 not the best choice from the ASUS...   I tested the STXII from the original swap kit (2xMUSES 8820, 2xMUSES 8920, 2xLME49720NA): I think this is the best config:   Buffer: 1 x MUSES 8920 I/V:     2 x LME49720NA   The 8920 and the 49720 are very similar. But maybe...

This is interesting too:   "For better dynamic – for Stravinsky – you have to swap OP-AMPs – put the 8820 in I/V and 8920 in buffer. J-FET have a high slew rate and are not very dynamic if used in I/V stage. Tested with MUSES01D and MUSES02D." - cristi   Link to Review.

  Oh, great. I'm very curious about your experience! And where did you order the Muses? On the eBay there are original Muses from China?   Thx! 

I think the best config would be the one Muses 02 & two Muses 01:   1x MUSES 8820 --> MUSES 02   (Bipolar) 2x MUSES 8920 --> MUSES 01   (J-FET)   Have you tried this?