I have strange problem with engine sound in Stadium and Canyon.
In stadion every custom car that have own engine sound is not making any sound during game. I can't hearing his engine. But if i delete engine folder that is in .zip i can hear it normally. But I can't do this when car skin is in .gbx format.
Every other custom car without own engine sound or Nadeo car working properly.
But is different in Canyon. There isn't a single car that that making engine sound

In car without sound engine i can hearing only some noise during driving. But what is more strange if i will volumne up sound to the max i can hear very but very quiet engine sound.
Every other sounds like music, drifting, or hittting the band i can hearing normally.
I searched on google to fix that but it's not showing me anything that would helping me.
Like here http://forum.maniaplanet.com/viewtopic. ... 64&t=17688
Most people helping changing sound quality but not for me

I tried reinstall game, use steam and non steam version. Nothing working