Descriptive Problem Summary:
When using 3D sounds, you would normally assign each sound to a separate channel so they can be controlled separately. According to the reference, there are 1024 channels available. However, channels 128 through 1024 do not seem to work. 3D sounds will cut each other off as if they're on the same channel.

Numbered Steps to Reproduce Problem:
1.) Download http://www.sendspace.com/file/xsk22e
2.) The first verb tests the 3D sound using channels 1 and 2. This works fine. The two crowing sounds moves around and they do not cut each other off.
3.) The second verb tests the 3D sound using channels 128 and 129. These two crowing sounds will cut each other off and it just sounds bad. Any channel after and including 128 will do this.

Expected Results:
3D sounds will not cut each other off as long as they are on separate channels from 1 to 1024 (according to the reference).

Actual Results:
Only channels 1 through 128 do not cause this problem.

Does the problem occur:
Every time? Or how often? Every time.
In other games? Yes.
In other user accounts? Yes.
On other computers? Yes.

When does the problem NOT occur?
When using a channel from 1 to 127.

Did the problem NOT occur in any earlier versions? If so, what was the last version that worked?
I've been messing around with 3D sounds for a long time and I never could get them to work right. Only now did I figure out that it's due to using channels >= 128. So this problem did exist in several previous BYOND versions, at least.

Workarounds:
Only use channels 1 through 127 when using 3D sounds.

Edit: Linked to the executable, not the source files. Changed to source files.