Music drums? If striking 8 drums at once, I don't think you can hear a few uS of difference - not until you get up into low mS,like 2-3mS, will you start to hear it. I made a audio digital delay machine a few years ago, and it needed delay set at 5mS before echo started becoming apparent.
So two direct port writes a few instances of 62.5nS apart are going to sound instantaneuos.
Even 1000 clocks apart is 0.0625microseconds apart. That's 16 KHz.