App downloaded as I saw it from some subcrawl alternative but I will try it out and see!Try them both ways. Probably won't be able to tell any difference because of the time it takes to reconfigure. It'll be like nothing you've ever heard!
Kind of a crappy alternative to a Umike is Advanced Spectrum Analyzer PRO or Spectroid for Android. It is subject to the limitations of your phones mic but it dialed my 2x VBSS system right in (nasty spike at 100hz, well within my phone's hardware capabilities). The most important thing is that your ear is happy, not necessarily an analyzer.