I think the sound was better with SVN r6143 in some games like Space Ranger.
Could you be more specific? I have listened to the audio in Space Ranger between r6143 and r6149, and did not notice any difference.
Unfortunately I have no more the r6143 to compare in detail. Maybe my feeling is subjective to think the sound was better in animation (small screen) before you start the mission. Also the music in gameplay.