Hi guys! How can I use MP3 for voicemail, incoming texts, and calendar alerts? Is this possible? Also, how can I make my ringtone as loud as possible?

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Look into /private/var/stash/Applications for the app you want to change a sound for. They're all in aiff format.

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iPhone 3GS factory unlocked (3.1.2; Blackra1n, Cydia, OpenSSH, custom 3.0 ipcc file (no sig), tethering hack by Dev team, 32 GB)
iPhone 3G (3.0.1; Redsn0w 0.8, Cydia, OpenSSH) 16 GB
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Mac OS X 10.5.8 / iTunes 9.0.2 (ipcc injection re-enabled)
Windows XP SP3 / iTunes 9.0.2 (ipcc injection re-enabled)
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volkpost, thanks for the reply. Now, I got 2 questions about that.

1) Must all my sounds for voicemail and incoming text be in aiff format?

2) Can't I change the formats to MP3? If not, then do I just simply rename the MP3 to aiff?

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Must be .aiff and the same name as the once you find in the apps directories. you have to replace them. make sure to backup the originals before

__________________
Read the stickies and search the forum before posting!
If you want to become a Hackint0sh supporter click here
----------
iPhone 3GS factory unlocked (3.1.2; Blackra1n, Cydia, OpenSSH, custom 3.0 ipcc file (no sig), tethering hack by Dev team, 32 GB)
iPhone 3G (3.0.1; Redsn0w 0.8, Cydia, OpenSSH) 16 GB
iPhone (2.2; Quickpwn 2.2) 8 GB
Mac OS X 10.5.8 / iTunes 9.0.2 (ipcc injection re-enabled)
Windows XP SP3 / iTunes 9.0.2 (ipcc injection re-enabled)
Windows Vista Ultimate / iTunes 9.0.2 (ipcc injection re-enabled)