spent a few days with OPA134P and find it to be a big improvement over the 5534.
i also received Muses02 and the aforementioned LME49720. but, i can only confirm that this preamp doesn't work with dual op amps. a bummer especially since some have reported to use it fine. and, some ads on ebay/ali have 6010D preamps using dual op amps and some use 5534/5532 mix.
