What format is your audio? The standard format for video is 16 bit 48 Khz wav format. MP3 can be very problematic. Try converting your file to a standard audio format.
Without any exact info about version of AE, file properties, system info, audio settings etc. nobody can tell you anything. Sorry, but "This doesn't work and AE sucks" kind of posts are useless.
Did you ever solve this audio issue? What worked for you? Please let us know!