Well,they did From T3 to T4.I think it would be much cheaper to print number 5 and stick it on number 4.We can still convince ourselfs it sounds much better.
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MIKIMIKI
TYROS 5,BEHRINGER X32PRODUCER,YAMAHA DSR112,JBL PRX618s XLF,EV ZLX12p,SENNHEISER E945,....ETC