Lpc2000

I am a newbie to USB. 

I want to develop a device that is 1) a soundcard and 2) a virtual 
COM port. I want to be able to plug this device into a computer USB 
port and have it operate as both a sound card and a COM port. 

I've been looking at all the different chips available for USB and 
I'm not sure of the best approach. I was hoping that there might be 
someone out there with a broad knowledge of the available hardware 
along with the USB experience that could suggest what to use to 
create this product. For example: can the FTDI FT2232 interface to a 
sound chip using a serial interface (SPI, etc...) via its MPSSE 
interface? I'm looking at purchasing the Keil MCB2140 evaluation 
board as it looks like the Phillips LPC2141 microcontroller can 
handle both functions in one chip. 

Are there any other USB devices out there that can perform these two 
functions? 

Thanks, 

Kevin