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Create sound for game Đôn Hổ from cpolcyn's sound 'Hummingbird Song' use Audacity:
- Select section 11.813s to 12:309s

- Noise Reduction...Get Noise Profile

- Noise Reduction...
Noise reduction: 18 dB
Sensitivity: 6.00
Frequency smoothing (bands): 3
Noise: Reduce

- Copy section 00.496s to 00.592s

- File→New

- Paste

- Effect→Normalize...
✓Remove DC offset
✓Normailze maximum amplitude to: -0.5 dB
✓Normalize stereo channels independently

- Effect→Repeat
Number of repeats to add: 27

- Generate→Silence… (02.689s) after last repeat
Duration: 00.400s

- Select 02.593s - 03.089s (last repeat and silence)

- Effect→Echo
Delay time: 0.1
Decay factor: 0.6