G-major III was collapsing B3 onto B2 after register -12 plus transpose -12.
Keep single register drop for III/IV; stack xpose only from V upward.
Co-authored-by: Cursor <cursoragent@cursor.com>
Match 转调说明 table: C~F keep normal register; #F~B lower bass/chord by one octave for all fret degrees. III+ register fix unchanged. RTT pitch test covers I/II+#F.
Co-authored-by: Cursor <cursoragent@cursor.com>
yuquanjun