[. . . ] In addition, a true, stereo chorus circuit utilizing two 65-watt power amplifiers gives this amp that lush, stereo chorus sound. The Fender® ULTIMATE CHORUS is one of the most "Expressive" amplifiers ever made. In addition to convenient features like All Front Panel Mounted Controls and Jacks, the ULTIMATE CHORUS features a detachable footswitch for selecting the Drive Channel and for activating the stereo chorus circuitry. [. . . ] TREBLE- Adjusts the amount of boost (accentuation) or cut (attenuation) in the high frequency range of the Normal Channel. MID- Adjusts the amount of boost or cut in the mid frequency range of the Normal Channel. This boost occurs pre distortion in the Drive Channel and will further modify the distortion characteristic. PRESENCE- Adjusts the amount of boost or cut in the upper high frequency range of the Drive Channel. This control occurs post preamp distortion and is useful in adjusting the distortion characteristic from brash, to smooth. VOLUME- Adjusts the overall loudness of the Drive Channel. C. D. M. DRIVE CHANNEL INDICATOR- This LED is illuminated when the Drive Channel is active. TREBLE- Adjusts the amount of boost or cut in the high frequency range of the Drive Channel. MID- Adjusts the amount of boost or cut in the mid frequency range of the Drive Channel. BASS- Adjusts the amount of boost or cut in the low frequency range of the Drive Channel. E. F. G. BASS- Adjusts the amount of boost or cut in the low frequency range of the Normal Channel. REVERB- Adjusts the overall amount of reverberated signal mixed with the original dry signal for the Normal Channel. GAIN- Adjusts the amount of preamp amplification in the Drive Channel. Cleaner sound is achieved at lower gain settings; high gain settings will produce more sustain and distortion. This control works in conjunction with the DRIVE VOLUME control (Item L) to set the overall loudness at the output while the Drive Channel is active. NOTE: This switch disables the Channel Select Footswitch and the Normal Channel controls. [. . . ] STEREO FX RETURN- This stereo jack inputs signal directly to the left and right power amps. A very light soapy solution on a sponge may be used to remove dirt and residue that may accumulate in the grain. Be careful not to let any liquid come in contact with operating surfaces. [. . . ]