Zentertain today released RingtoneMaker PRO 1.0 for iPhone 3GS/4. RingtoneMaker PRO allows you to make ringtones from your own iPod music and apply advanced effects such as pitch shifting and time scaling. With pitch-shifting, you can make a male singer’s voice sounds like female and vice versa. And with time-scaling you can make peaceful songs more energetic and vice versa. RingtoneMaker PRO is one of the best tools on the market to make your ringtones unique and interesting.