Usually when people think of adding sound effects to the BlogTalkRadio service they think of making and uploading mp3's or wav files & then selecting them from the dashboard and clicking on them to play. This is a laborious task, the files are often difficult to find on BlogTalk if there are a lot of them, and it doesn't work if the hosts PC has frozen up. The method I'm using here is to call in from a 2nd line (a Magic Jack* attached to a PC) and choose headphone input. From there it's easy enough to run a line from the stereo output of a tablet or any other sound ouput device directly into the mic port on the computer, and from there to the show. Voila! Call in to host the show on your regular phone (I use my cell phone with headset) and call in as an on the air guest using your MagicJack. Now talk and have other callers online too... and use your sound effects whenever you feel the need! You're done! No files uploaded and you're in complete "live studio" control of what gets played through your tablet, smart phone or whatever other sound producing device you have hooked up to your computer's microphone input.
* NOTE: Magic Jack: You have to buy prepaid minutes at http://my.magicjack.com/prepaid/ to use Magic Jack with Blog Talk. Apparently conference calls and "platforms" aren't covered in the basic Magic Jack annual fee. But 1,612 minutes for $10 plus tax for the MagicJack to work with BlogTalkRadio isn't bad since it's only charged during such calls.