Well, I'm more than a little interested in the memory card reader, as 9-in-1 is the standard...I've never seen a 30-in-1 before. As to which type to use, you should choose either SecureDigital (SD) or CompactFlash (CF), as those are the two most commonly supported by handhelds. If your PDA handles both, either would be fine, but if it only accepts SD cards it wouldn't be wise to put your music files on a CF card. Of course, the high-speed cards offer better performance, but that shouldn't be necessary for playing music and may not be supported by older handhelds.
Hope this helps,
If I have a memory card reader that can be used with 30 different types of memory cards. What type of memory card would work the best