// Get the recorder instance  
TXUGCRecord *recorder = [TXUGCRecord shareInstance];  

// Set BGM file path  
[recorder setBGMAsset:path];  

// Set BGM using AVAsset loaded from the system media library  
[recorder setBGMAsset:asset];  

// Play BGM  
[recorder playBGMFromTime:beginTime  
                   toTime:endTime  
          withBeginNotify:^(NSInteger errCode) {  
              // Playback start callback. errCode 0: success, others: failure  
          } withProgressNotify:^(NSInteger progressMS, NSInteger durationMS) {  
              // progressMS: elapsed time (ms), durationMS: total duration (ms)  
          } andCompleteNotify:^(NSInteger errCode) {  
              // Playback complete callback. errCode 0: success, others: failure  
          }];  

// Stop BGM playback  
[recorder stopBGM];  

// Pause BGM playback  
[recorder pauseBGM];  

// Resume BGM playback  
[recorder resumeBGM];  

// Set microphone volume (used during BGM mixing)  
// volume: 1.0 is normal volume. Recommended range: 0-2. Higher values allowed for amplification.  
[recorder setMicVolume:1.0];  

// Set BGM volume (used during BGM mixing)  
// volume: 1.0 is normal volume. Recommended range: 0-2. Higher values allowed for amplification.  
[recorder setBGMVolume:1.0];