 	case Acoustic1
 	case Acoustic2
 	case Acoustic3
-	case Acoustic4
+	case AcousticTWOrgan
 	case DrumSet1
 	case DrumSet2
 }

		} else if partByte == kPartTypeAcoustic3 {
			mainType = .Acoustic
			subType = .Acoustic3
		} else if partByte == kPartTypeAcoustic4 {
			mainType = .Acoustic
			subType = .Acoustic4
		} else if partByte == kPartTypeDrumSet1 {
			mainType = .DrumSet
			subType = .DrumSet1

private let kPartTypeAcoustic1 = 0x59 // MSB: 89
private let kPartTypeAcoustic2 = 0xD9
private let kPartTypeAcoustic3 = 0xDA
private let kPartTypeAcousticTWOrgan = 0x5C
private let kPartTypeDrumSet1 = 0x56
private let kPartTypeDrumSet2 = 0xD6

