I recently received a Mavis. I am having difficulty keeping it in tune. Using the calibration settings from the manual, I can get the onboard keyboard kind of in tune, low C and high C are spot on, every note in-between is flat. When I connect it to my Synthstrom Audible Deluge, I can get the low C tuned to whatever octave I choose, but then going up the scale it goes so flat that the high C of that octave is a B. That is just in one octave. If I scroll up or down an octave, the notes don’t match at all low C becomes an F#. This is not the case with my external digital Modal synth.
Long story short, on it’s own Mavis is somewhat in tune. Playing with others, it’s not even close. This is the first synth I have owned that needs calibration and tuning. Has anyone else had this issue or am I doing something wrong? It is really hot in my apartment. I’m in Seattle and most places don’t have AC, could the 90 degree heat be causing this? Might it be more stable once temperatures go down? Any advice would be greatly appreciated.