音量增强器 — Extra Volume Booster

This is a powerful Volume Booster. It can increase the volume of the low-level audio files to higher quality sound than the default value of the system to obtain additional volume enhancement and sound amplification effects.
Extra Volume Booster ensures that there is no distortion when increasing the volume, so that all sounds of low-level audio files or weak microphone speakers can be clearer and stronger.
Key Features:
Boost Volume up to a maximum of 1000%+.
Improve the low quality sound files to louder and higher quality.
Subscription:
Volume Booster offers $6.99 per month , $26.99 per year subscription and lifetime purchase only $29.99. By tapping 'continue', your payment will be charged to your iTunes Account at confirmation of purchase. Your subscription will automatically renew unless the auto-renew is turned off at least 24-hours before the end of the current period. Subscriptions may be managed by the user and auto- renewal may be turned off by going to the user's Account Settings after purchase.
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