The API 512c gave me a knew appreciation for the sm57. I've been pretty well been using this combination for the last couple years exclusively. As I recording some guitar solo's with an es 335->mesa single rec I was finding the tone just to fizzy. Eq would basically get me where I need to go but I wanted to get the tone from the get go. The winner was a KM84 -> shadowhills. When I played rhythm the 57 was superior but solo parts the km 84 was awesome. I am thinking it is time to open this can of worms again. Of course a lot of people love the royer 121. Before I bought high end pre's I tried the royer and wasn't super impressed. I know my cheap ribbons that barely get used sound much better through high end pre's so perhaps its time to try it again. On the other hand I get files to mix from time to time from a guy that uses the royer with a great chain and I am never digging the figure 8 pattern with the room reflections in the guitar sound. It is easy enough to fit in a mix but I prefer a far more direct sound. I will be trying the royer in my own studio. Any suggestions on how to get it more direct sounding. I've seen some guys use reflexion foam etc behind the mic.