Hi. I recently switched from piano accordion to button accordion. I sold an Iorio Accorgan, too large, old school. I am making some progress using the manual to learn all the control options, but can someone explain in detail exactly how I can get to the option to control the Reverb?; What switches, how many times to push the option, etc., to get to (r L) on the digital read out, and how to save it? It seems I need to go through the parameters, and doing something wrong. The manual is good, but also confusing. Any info would be greatly appreciated. Thank you.