GT1: fix for Sound Effect setting not working in Jap version

[eadmaster]

When i toggle this setting it seems to have no effect In Duckstation.

Am i missing something or this is a bug?

(in the USA version there is no such bug and i can lower the volume of the car motor)

[CookiePLMonster]

This is intended and not a bug - that's how this option works in the JP version. It just got changed later.

[eadmaster]

which sounds does the "Effect" toggle turns on/off then?

Can you make a cheat code to disable the car engine sound in the Jap version?

(Or a script to import the Jap OST into the USA release)

[CookiePLMonster]

which sounds does the "Effect" toggle turns on/off then?

Apparently tire sounds and collisions.

Can you make a cheat code to disable the car engine sound in the Jap version?

Not currently - it may not even be possible to do with a cheat.