diff --git a/SwiftAudio/Classes/TimeEventFrequency.swift b/SwiftAudio/Classes/TimeEventFrequency.swift
index 93e8e31..c7548c4 100644
--- a/SwiftAudio/Classes/TimeEventFrequency.swift
+++ b/SwiftAudio/Classes/TimeEventFrequency.swift
@@ -13,12 +13,14 @@ public enum TimeEventFrequency {
     case everySecond
     case everyHalfSecond
     case everyQuarterSecond
+    case custom(time: CMTime)
     
     func getTime() -> CMTime {
         switch self {
         case .everySecond: return CMTime(value: 1, timescale: 1)
         case .everyHalfSecond: return CMTime(value: 1, timescale: 2)
         case .everyQuarterSecond: return CMTime(value: 1, timescale: 4)
+        case .custom(let time): return time
         }
     }
 }