The tuning settings in MG dont do that much, since MG doesnt recognise which string is played. So only the 6th string setting will determine what the lowest note is. Lowest in polyphonic mode is chosen with the tuning setting of the 6th string. In mono mode the lowest note is allways C.
On iOS you can use my PD Space Guitar app to work as a fast pitch shifter, that way you can use 7, 8 strings and bass polyphonically with MG.
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