Create a new FDS instrument and define a waveform of your choice
Create a 2a03 instrument
Try jamming on the FDS channel with the 2a03 instrument selected
Now select the FDS instrument and start jamming
The waveform that plays is now a square wave with a 1.5625% (or 1/64) pulse width.
At least it's a very minor thing; as soon as you copy/paste the waveform back or hit the play button, everything goes back to normal. I just thought I'd point that out.