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The 2018's volume gain pot is cranked all the way up,the radio's mic front panel knob is  all the way up,the only limiting factor is that the 959's modulation is set for 100% modulation in the DTB Radio state of tune. This makes it loud but not into splatter. The RD kicks it over 100% and is cutting through Motor Mouth Mauls and John Denver some of the time to a another operator 6 miles away on a base with a Maco V58. I'm on my Sirio Performer PL 5000.(2018;Echo volume 8 1/2,echo delay 1 1/2,  n.r. Off, D.T. On. )