loop mode buzz

hey all

anybody know why N does this:

loop mode is on. when the cursor gets to the end of the loop segment it buzzes for about a second - digital buzz such as when you loop a very small number of samples - before it retarts the loop

this is in a session with 13 tracks yet 12 are muted.

it’s distracting, annoying and dangerous to my monitors.

anybody? is this some artifact of the track count being “high”?

(delta44, xp pro., N 4.0.4 b1785) P4 1.8G 256MB)