organize

check cx3 manul pg 18 (pdf) Amp Gain [0...99] Adjust the gain (amplification) when the 'Amp Type' parameter is set to Type 1 or Type 2. With high settings of this value, the sound will be distorted more severely when expression/overdrive is raised.

Are you using preamp mode in the rotary section of the CX3?(pg. 19 of CX3 manual) this bypasses the rotary effect and and has more mids in the last octave this should help when using an external rotary speaker also play with amp type 1 and the 2 this will affect the mid-frequency range of the amp selected by the 'Amp Type' parameter. also adjusting the mid frequency eq in preset mode will also help