None of the vehicles in the pack use custom sounds, nor RHS sounds - apart from the reskins of their vehicles. All of the vehicles I have ported use BI sounds either through direct inheritance from one of their classes, or I specify the BI sound in the vehicle config. Either way, they all use BI sound effects for engines, wheels, crashes, the lot.... I would not compare RHS with BI sounds, but perhaps if you place some of the added vehicles - such as the M60 or T-72 and compare it with normally the Blufor equivalent you will see that they are similar.

Thanks for quick reply. Tested them again in v.4.0.3 and they sound great. Our community did have TVT event couple weeks ago with version 3.0.2 and there we noticed tanks sounds being quiet. Was it bug? I am not sure about that time, but they sound good right now, so I don't have anything to complain.

Great. Thanks for letting me know. I have been constantly improving and fixing things based on feedback so it is entirely possible I manually tweaked the volume db or changed which vehicle they were inheriting from. I did recall after my original reply that I did change the T-55 and T-34s back to the old arma 2 sounds as initially it sounded as if they had a turbine engine as they were inheriting from a BI tank.