Yes you can do it - its just difficult
You have multiple options, some free, some not
1. ToneFX - Available in the Cydia App Store, cost is $4.99 - allows you to change ANY tone on the device to specific tones uploaded from your computer. Change the Calendar alert beeps, or the SMS tones.
2. OpenSSH - More complex, possibly confusing to an amateur jailbreaker, requires you to convert audio files to AIFF, then use a program like WinSCP to SSH into the phone and copy files over that way - more dangerous as it can brick your phone, but this is the free way.
04-22-2010 07:39 PM