Low latency audio in windows CE 5.0

Hi,

I am building an application where I record sound, filter it, and plays it. I have implemented this using the standard waveform API but gets a latency of around 200 ms. The buffers are only 16 ms wide and computations are completed in much smaller time, so this must be a delay in the waveform API. I have searched around and found that technologies such as ASIO or directsound might help, but neither are supported under CE 5.0. How can I achieve a lower latency

Thx,

Andreas