I think this is related.
For managing flashcards, I like to do it on the PC and then export to the handheld. Specifically, I use the desktop flashcard program to create the initial arrangement and configuration my files on the desktop, including hanzi/pinyin/definition. From there it is very easy to export to Pleco format - Pleco is where all the studying is done. I don't like sitting in front of the laptop studying.
I also record sentences and with the desktop program, attaching the audio to the pinyin card side. I have my friend record the audio for 150 individual sentences/cards. They can complete the task in less than a half hour.
Unfortunately, there is no way to copy audio to the handheld computer so I autoplay the flashcards, 1 card every 6 seconds and capture the audio for listening on my mp3 player.
I personally would love to find a way to get the recorded sentences imported and active on Pleco, or to record directly on Pleco. I think there are other flashcard programs out there that can record audio, but they are not easy to use, and are certainly not fused with Pleco's essential functions.