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@interface Sampler : NSObject <CAUITransportEngine, CAUIKeyboardEngine>
#pragma mark properties
@property (strong, nonatomic) UIImage *audioUnitIcon;
@property (nonatomic) bool playing;
@property (nonatomic) bool recording;
@property (nonatomic) bool connected;
@property (nonatomic) Float64 playTime;
#pragma mark methods
NSString *formattedTimeStringForFrameCount(UInt64 inFrameCount, Float64 inSampleRate, BOOL inShowMilliseconds);