I have a very simple one button momentary foot switch with a TS connection. I want to use it to set tap tempo. I had it working at one time, but I must have touched something and now it will not work. All it does is turn the tap tempo feature on and off, instead of setting the bpm. Im at a loss here. I can get it to work from the P switch to set tap tempo, but not from my external switch. Tap Tempo under the External Control menu, has all options available except Expression pedal 1 and 2 is greyed out. Any guidance would be helpful. Thanks in advance.