Sound Shift for iRacing is software that provides audio cues for gear selection, brake force and rev limit. All can be adjusted and even muted if you don't want all cues. This service contains its own Sound Shift files for iRacing users to download and use for their installation. Especially useful when new cars enter the service.
Why do you think that https://github.com/Esterni/pyracing is a good alternative to nspace.hu-soundshift