hello- in conceptualizing a custom project involving expression pedal control- ive been collecting data on the various pedals involved- mainly the max voltage allowable on the tip/ring. thus far- all companies ive contacted have been quite helpful in providing the specs on their products (ehx- empress- guyatone- robot factory). however- in contacting roland/boss regarding the PS-3 i got the following response: "Unfortunately, the input spec for the EXP jack on the PS-3 is not published by BOSS Japan. We can only recommend that you use the EV-5 or FV-500H/L with the PS-3." 1. im not sure what boss japan has to do with anything. 2. why wouldnt boss provide this information? 3. does anyone happen to know the ring/tip max voltage for the expression input on a PS-3? thanks in advance for any help you can provide- as the response i got was both extremely unhelpful and surprising.