Best media player to play ultrasonic on?

[Shannon]

It's not hard to create the equivanent of a playlist with Audacity if you import each program as a separate track and then use the mover tool to set track 2 to start at the end of track 1 and so forth. Then just shift+left mouse, and it loops for 8 hours. Then you have to re-set it.

VLC would be my player of choice otherwise... leading or trailing static is a sign that some setting somewhere is off, if you don't get it in all players. Probably volume.

I can't speak specifically for Windows or Mac since I use Linux almost exclusively.

this way the result would be:

sub 1
sub 2
sub 1
sub 2..

am I getting it right? i thought it was:

sub 1
sub 1
sub 2
sub 2

You are correct. I didn't say Audacity was the best option for multi-track play in this case... just that it's not hard to do.