so I need to increase (for any value in parameterCurveControlPoints) like this way:
private func playHapticLoop(named filename: String, speed: Float) {
guard
....
let appleHapticAudioPattern: AppleHapticAudioPattern = AppleHapticAudioPattern(data: hapticData),
....
guard let pattern = appleHapticAudioPattern.pattern?.first(where: { $0.parameterCurve?.parameterCurveControlPoints != nil})?.parameterCurve?.parameterCurveControlPoints else {return}
for i in pattern {
i.parameterValue += 0.4 // here i got xcode error = "Left side of mutating operator isn't mutable: 'i' is a 'let' constant"
}