hi Alan,
you can replace the allowscriptacces to anything you'd like, as long
you don't click on links in player or communicate with player's JS API
it shouldn't make any difference.
on the other side, the player's full functionality is avalable only on
'always's setting. samedomain in your case is the same as 'never',
because the player's domain is
player.soundcloud.com and yours is
probably something different.
cheers,
Matas