At the end of March 1959, Porter took over as chief engineer at RCA's Nashville studio, in the space eventually known as Studio B after the facility expanded with a second studio in 1960. (At the time, RCA's sole Nashville studio had no letter designation.) Porter soon helped Atkins get a better reverberation sound from the studio's German effects device, an EMT plate reverb. With his golden ear, Porter found the studio's acoustics to be problematic, and he devised a set of acoustic baffles to hang from the ceiling, then selected positions for microphones based on resonant room modes. The sound of the recordings improved significantly, and the studio achieved a string of successes. The Nashville sound became more dynamic. In later years, when Bradley asked how he achieved his sound, Atkins told him "it was Porter." Porter described Atkins as respectful of musicians when recording—if someone was out of tune, he would not single that person out by name. Instead, he would say something like, "we got a little tuning problem ... Everybody check and see what's going on." If that did not work, Atkins would instruct Porter to turn the offending player down in the mix. When Porter left RCA in late-1964, Atkins said, "the sound was never the same, never as great."