How to change sound effects transparently to give changing tone/frequency impression? eg motor engine

Here is the error I get on Windows Simulator: (including the misspellings)

08Testing errpr before unqueue because getting stuff, for OS X this is expected: Invalid Name

and, of course, the pitch doesn’t change.

On edit: no, my fault. It all works, I was giving it a nil value for the source and getting that error. [import]uid: 160496 topic_id: 30310 reply_id: 121459[/import]

Something triggered an OpenAL error. I’m not sure what. That could break pitch, but I think it should work despite that.

Can you try a very basic test:

local mySound = audio.loadSound(“some_mono_sound.wav”)
local channel, sound_object = audio.play(mySound)
al.Source(sound_object, al.PITCH, 2.0)

Make sure your sounds are mono. OpenAL will not apply effects to stereo sounds.
[import]uid: 7563 topic_id: 30310 reply_id: 121462[/import]

Glad to hear it is working after all.
[import]uid: 7563 topic_id: 30310 reply_id: 121463[/import]