The channel hues goes sequentially from red to red. I'd suggest to shuffle the order into 4 groups of 4 "hue families" - GBYR.
something like this:
voices 1-4
https://paletton.com/#uid=73c1q0kuLTxiIV4oNUjN+RMOGur
voices 5-8
https://paletton.com/#uid=73y1q0kuLTxiIV4oNUjN+RMOGur
voices 9-12
https://paletton.com/#uid=73U1q0kuLTxiIV4oNUjN+RMOGur
voices 13-16
https://paletton.com/#uid=74f1q0kuLTxiIV4oNUjN+RMOGur
(Notice the hue is not HSB based)