How can I stream to Airplay and Bluetooth simultaneously? I have an iMac with airport express and I also have a logitech bluetooth speaker adapter.

Seemingly I cannot play through both at the same time.

I have even tried going to the MIDI settings and creating an 'aggregate' audio device but it just flips back after a few seconds of it being selected (to a working method)

EDIT: Snow Leopard 10.6.8
The app Airfoil allow multiple output synchronization (you can download a 10.6 version here (Airfoil for Mac 3).