I have just recently purchased a newer style JC 120 with the dark cone speakers. (not silver cone) Instead of the up-and-down switch for the Chorus/vibrato setting, it has a knob that you turn either left or right.

The Rate / Depth knobs adjust the vibrato, but do not affect the chorus in the least bit. I talked to Roland and they thought that the chorus is fixed and cannot be adjusted. I talked to a guitar tech at a shop and he said that he thought the chorus is adjustable with the Rate / Depth knobs just like the Vibrato. (on the older models anyway)

I have an older JC-55 2x8" amp. It doesn't have Vibrato, but the chorus has a "fixed" and a "manual" position. In manual, it is adjustable with the Rate / Depth knobs. In fixed, it sounds just like my JC-120.

Do any of you guys have a newer style JC-120? Is the chorus fixed on your amp? Is mine broken?

Please help.

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Custom built Swamp Ash P90 strat
Taylor 410ce
Roland JC-120
Roland JC-55
Fender Acoustasonic SFX Custom EXT.

Route 66
RP6 (retired)
GNX-2