The imitation is quite popular, and many people ask about the tutorial.First of all, you have to install the accessories that simulate sound waves on the car, and if you don't know how to install it, you can search on the Internet. It's just that no one says anything about the tutorial.1. Register for unit A9
2. MMI engine sound call-out option
After calling out, there is a meter on it
Then flash an RS4 or RS6 firmware, and the test effect is as follows
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