Phoenix Edition v3.1 released!

[SMcNeill]

IF snd AND D! > 0 THEN
        SOUND Hz, D! + .4 * -(D! = 0)

 You may want to rework your duration for your SOUND statement.  D is greater than 0, so D can never BE zero in your formula, making the D = 0 FALSE

SOUND Hz, D + .4 * -(D = 0)
SOUND Hz, D + .4 * -0
SOUND Hz, D

I don't know what D is in your program, but you may want to tweak it for the new backend where our timing is much closer to what's expected.  Maybe try SOUND Hz, D / 10