Swift 2.0: Type of Expression is ambiguous without more context?

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You could give the compiler more information:

let recordSettings : [String : Any] =
[
    AVFormatIDKey: kAudioFormatMPEG4AAC,
    AVEncoderAudioQualityKey : AVAudioQuality.Max.rawValue,
    AVEncoderBitRateKey : 320000,
    AVNumberOfChannelsKey: 2,
    AVSampleRateKey : 44100.0
]

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