Quality: Excellent (any bitrate is fine)
If you don't know what an MP3 is by now you've been in a deep slumber. Well, wake up. It's the most popular music file out there. I use the trashcan to get MP3s; it's excellent.
1. Open Sound Forge
2. Get the sound/file you want (via loading an MP3 or recording)
3. Use your keen logic skills to figure out a clip to use as a ringer (I've found hip hop beats to be good)
4. Highlight it and crop it (edit=>trim/crop)
FOR MP3s: Save as an MP3; goto Step 8. For QCPs continue.
5. Change the sample rate to 8kHz (process=>resample)
6. Save as a 16-bit mono wav, use a short one word name(file=>save as...) to where you installed/uncompressed the WAV to QCP converter
7. Here's the tricky part... 
* open a command prompt (start=>run=>cmd)
* navigate to the directory where you saved the wav file to/where the wav to qcp converter is
C:\>cd \lg vx6000 hacking\QUALCOMM PureVoice\PureVoice converter\
C:\lg vx6000 hacking\QUALCOMM PureVoice\PureVoice converter>dir
Volume in drive C has no label.
Volume Serial Number is B448-2C92
Directory of C:\lg vx6000 hacking\QUALCOMM PureVoice\PureVoice converter
09/11/2003 01:14 PM DIR .
09/11/2003 01:14 PM DIR ..
09/08/2003 03:56 PM 1,411 command.lnk
09/11/2003 01:08 PM 62,172 hive.wav
08/07/1998 04:54 PM 4,989 PVConv Readme.txt
08/06/1998 11:54 AM 172,032 PVConv.exe
06/03/1998 05:35 PM 3,470 PVsample.qcp
09/08/2003 03:57 PM 44,208 pvsample.wav
09/09/2003 03:39 AM DIR tests
6 File(s) 288,282 bytes
3 Dir(s) 3,023,994,880 bytes free
C:\lg vx6000 hacking\QUALCOMM PureVoice\PureVoice converter>
For this example I'm using "hive.wav"
* type "pvconv hive.wav hive.qcp", hit enter
C:\lg vx6000 hacking\QUALCOMM PureVoice\PureVoice converter>pvconv hive.wav hive
.qcp
C:\lg vx6000 hacking\QUALCOMM PureVoice\PureVoice converter>dir
Volume in drive C has no label.
Volume Serial Number is B448-2C92
Directory of C:\lg vx6000 hacking\QUALCOMM PureVoice\PureVoice converter
09/11/2003 01:23 PM DIR .
09/11/2003 01:23 PM DIR ..
09/08/2003 03:56 PM 1,411 command.lnk
09/11/2003 01:23 PM 4,620 hive.qcp
09/11/2003 01:08 PM 62,172 hive.wav
08/07/1998 04:54 PM 4,989 PVConv Readme.txt
08/06/1998 11:54 AM 172,032 PVConv.exe
06/03/1998 05:35 PM 3,470 PVsample.qcp
09/08/2003 03:57 PM 44,208 pvsample.wav
09/09/2003 03:39 AM DIR tests
7 File(s) 292,902 bytes
3 Dir(s) 3,023,839,232 bytes free
C:\lg vx6000 hacking\QUALCOMM PureVoice\PureVoice converter>
Notice that hive.qcp exists.
* close to command prompt (type exit, hit enter)
To test: run the PureVoice player and load the QCP.
8. Rename the QCP/MP3 file to all numbers(I'll rename hive.qcp to 123.qcp or hive.mp3 to 123.mp3)
9. Open Bitpim
10. Click on the "Ringers" tab
11. Right click in the whitespace (not on a file), click "Add," find file, click ok
12. Goto "Data" (on filemenu)
13. Click "Send Phone Data"
14. Check "Ringers," choose either "add" or "replace"
15. Hit OK
16. On phone: Left soft key (for Menu), "7" (My Media), "2" (Music), highlight new ringer, left soft key (Set As), choose your setting.
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Hmm, the instructions are out there and pretty easy?