Great, thanks for the info, everyone!
I have a question about something else that I'll probably create another topic for, but yesterday I was importing a .wav file to my DP-24, (first time I've done this), and after I selected 'track 1' of a new song I created to import the .wav file there (small file, just a click track), the DP-24 froze. I hit the power button to turn the machine off but that didn't work so I had to unplug it. When I powered it back on, the graphics in the display showed for a bit then froze. I tried this a couple more times, then when it was powered off, I removed the SD card (the original one that came with the machine) and it started fine. So I broke the SD card while importing the file somehow.
The .wav file was exported from EZ Drummer 2. I selected 24 bit (as my new song was 48khz, 24 bit), and I actually first tried importing that file, but it didn't allow me because the file was 44.1 khz. So I opened that .wav file in Adobe Audition and exported it at 48khz. I then was going to import it and the options for track were 1-2, 3-4, etc. So I realized I was exporting that file from Audition as stereo. So I went back to Audition and exported it as a mono track. So then it allowed me to choose track 1 for my song, then it froze. So I'm not sure what killed my SD card. The only songs on the card were the demo song that came with the machine and one other song that just had a guitar and bass track, so it's not like it was full. Any ideas?