Play promo clip before audio

Does anyone here have any ideas on how to put a 10-30 second promo in front of the audio played out using the 1pixel player in the audio module? The KBOO.FM pledge drive is coming up, and they'd like to add a small promo file just during the drive (not permanently part of the actual files).

I guess it could be done with a playlist, but before I try to write custom code, thought I'd look for a ready-made solution.

I posted this question here (http://drupal.org/node/231395) but got no response yet.

Thanks,

Roger