I just bought a Jupiter X used, the synth looks mint and I'm going through the sounds and everything seems to be in working order.

However, I cannot hear any reverb. I've got the reverb dials turned to max and the reverb button shows red.

I just want to do a run down of the unit and make sure everything is working properly. I'm probably just not using it right or I don't have the right setting.

However, no matter where I turn the reverb knobs, the sound is the same.

Could somebody walk me through a simple way to simply check that the reverb is working and not user error?

Thanks.

Anything else I should check ?