Okay, I had the same problem even when I built my first soundmod.
Here is the short version of what you have to consider everything when exporting the BANK.
1. Export from FMOD bank and guid.
2. Edit the GUID like this:
{431fb779-148d-4b16-aaab-52eeb2c65640} event:/cars/yourname/backfire_ext
{b3bfdbea-1234-4187-a7ae-7d4cdd7733d9} event:/cars/yourname/backfire_int
{806844fc-8742-49c4-a2af-b50000eb2dc1} event:/cars/yourname/bodywork
{778ebd3c-e5df-47f9-a7b4-6f90b0ee4628} event:/cars/yourname/door
{da730ab5-fac8-4053-bcbc-e5e9aad62318} event:/cars/yourname/engine_ext
{b0b4d0ad-e7f6-43d2-bb85-ce578a596b96} event:/cars/yourname/engine_int
{79068e60-2e68-4071-9b16-109ebe9b3393} event:/cars/yourname/gear_ext
{0ee188c3-98f4-4572-bde3-6cadcc14d51b} event:/cars/yourname/gear_grind
{1d030c53-1d77-44e8-8586-b6fe5a5dc5dd} event:/cars/yourname/gear_int
{b6820ea4-617d-48c1-8cd3-2e4ca8cbea7c} event:/cars/yourname/horn
{08efac47-cc16-4a10-b73e-fed5a2bf9320} event:/cars/yourname/limiter
{38362039-2075-4eb9-91e5-6200f9f1d4e3} event:/cars/yourname/skid_ext
{ea46972e-8594-4a54-976f-01688943c0d4} event:/cars/yourname/skid_int
{ea3b8f58-f2d6-4d02-bf92-85461b3d3888} event:/cars/yourname/tractioncontrol_ext
{fcff67ea-f037-4a55-b5d4-a4dc6e337dbb} event:/cars/yourname/tractioncontrol_int
{089793a6-e7a3-4262-806d-4ff0281406f8} event:/cars/yourname/transmission
{c76e2923-cf98-425c-9c4e-22a20ac0891f} event:/cars/yourname/turbo
{cfb442dc-daca-4705-bec1-caf7dd4bfabf} event:/cars/yourname/wheel
{19c17954-1109-4225-b81e-fff635faa85a} event:/cars/yourname/wind
{08f6ba78-f576-4f9f-a232-47657d5fec19} bus:/
{9e2b6406-bcd0-4f61-92a5-b3e5d68d4b97} bus:/grp_backfire_ext
{477be05a-5cbd-468a-b1d8-637af58bba28} bus:/grp_backfire_int
{b3c3876b-83aa-45d3-b43a-125adcb9a753} bus:/grp_bodywork
{f915798f-0669-4379-b31a-6ec19e8af0ea} bus:/grp_collisions
{559b9037-dd6c-4120-9373-477d07717f9e} bus:/grp_door
{5206e42b-ae8f-49f6-b059-d613b2947b49} bus:/grp_engine_ext
{db9dca15-49f5-4c00-93ca-e76ccaf1160e} bus:/grp_engine_int
{c9a0a35d-dcc0-4002-ae01-5487466de9f8} bus:/grp_gear_ext
{f09ce222-1e68-42a9-9e16-fcb45004fcb3} bus:/grp_gear_int
{c89669bc-901a-4b52-91b7-46a85014ee0d} bus:/grp_horn
{37b936f8-165c-484d-a2f5-d06ae99a0822} bus:/grp_limiter
{81c0ee3a-2fd8-4e25-b775-eb7845ca644f} bus:/grp_skid_ext
{37bf169d-f171-4af4-a924-d65a1f998264} bus:/grp_skid_int
{ce5395d1-28c9-4dcc-90bd-051528b365d3} bus:/grp_surfaces
{9d0c46e7-d738-480e-8d5f-b5fb315a701a} bus:/grp_tractioncontrol_ext
{dcf6df4b-a019-4819-97e4-d1b3ed67e4b1} bus:/grp_tractioncontrol_int
{dba03e3d-9c12-43da-a5b9-9c79b7673c7f} bus:/grp_transmission
{35927822-c7cf-43ab-b6a2-447a4386450e} bus:/grp_turbo
{b7b6c398-22ee-465a-a6df-42861188e195} bus:/grp_wheel_closed
{208daf59-324a-4a13-994e-d284dac196ce} bus:/grp_wheel_open
{bec567db-3040-4ca9-82f7-75f072ab68c8} bus:/grp_wind_closed
{1c1f5d35-07d5-4d6f-b916-cd0eb4adfd60} bus:/grp_wind_open
{94f04703-a92c-49cf-a097-734f3e79ec08} vca:/vca_engine_ext
{ff157bb9-ecc1-49da-ad82-5e42fecb2ac9} vca:/vca_engine_int
{f8b9d9e5-bd29-4a82-a1a0-66e8b9059ccb} vca:/vca_skid
{45401f11-f5bd-429f-afb6-710deda49e32} vca:/vca_surfaces
{a61eba16-8f14-4a39-8ffd-c573cfdc0dbd} vca:/vca_transmission
{185673e8-d3ed-434c-acd4-61c819bb209c} vca:/vca_wind
{4b92e6ce-e701-48dd-8dc2-cb371c15dbfe} bank:/yourname
Replace "yourname" with the name of the folder containing all the data, for example "ks_lamborghini_huracan_performante", and name the bank as well. Delete all lines of text in the GUID that do not match the above.
If it still has no sound, that was the case with me at the beginning, check if your FMOD version is compatible with your AC version. Is under "Assetto Corsa \ sdk \ audio / AC Audio Pipeline 1.X" at "The FMod Studio version used is:".
