The appeal of the TCH-1 lies in its clear chorus effect; it is a complete stereo chorus, equipped with two outputs. A rich, realistic sound, with low noise and so on, characterizes this high-quality pro-use model. In addition to electric guitars, the TCH-1 can also be used to full effect with keyboards.
 Unit works as it should.

Speed: This knob regulates the vibrato speed of the chorus effect. Turning it to the right increases the speed, while turning it to the left decreases it. Tremolo and vibrato effects may also be obtained.

Depth: This knob controls the depth of the chorus effect. Turning it to the right produces a deeper chorus effect, while turning it to the left produces a lighter chorus effect.

Rev.: Out: direct sound + effect sound

Sub Out: direct sound - effect sound

Sep.: Out: effect sound

Sub Out: direct sound

Works with a 9v battery. If 9 volt battery is not used then can use BOSS pedals as power supply such as TU-2, TU-3, LS-2, PSM-5 and other power adapters can be used if they have sufficient power (see Correctly powering your old pedal (ACA vs PSA simplified, from Cool Old Guitars site)