Unlike download managers like Mass Downloader, HiDownload, NetTransport, FlashGet has no powerful scheduling features.

It can be used if you say have cheap Internet access at night and wanna make major downloads at night hours. To schedule downloads with FlashGet:
1. Click "Tools"->"Options"
2. Click "Schedule/Event" from the left list.
3. Change scheduling options.

After that you may use these sheduling options for some of your downloads. To do that create a new download and:
1. Click "Advanced button"
2. Select "Schedule" from the "Start" list.

What kind of audio streams do you record? There might be better stream recording software that can do the job for you.