Stereo D/A via USB

[hubidrei]

Hello, I need a 2 Channel DA Conversion.

It should work via USB and should be as fast as possible >= 2*22kHz I use it for my open Loop Galvo Scanners.

I use a 18f14k50 or 18F22k50 and a (SPI) MCP4822 D/A converter.

My first tests was made with a bus pirate.

At the moment I use USB Serial. My question: Is there a faster way? maybe USB Audio (HID)? 

My former tests with wireless RFM70 transmitters was too slow, so i switched to direct USB connection.

Is there any howto or tutorial for HID USB Audio?

hhd