Simple ALSA capture/playback example and help wanted

[Howard Abrams <abramsh@acm.org>]

All,

I'm new to ALSA, and I'm using whatever version is in the
2.5.7 kernel w/ a Midiman Dio 2448 (cmipci driver).

I'm trying to write a simple app that reads some samples,
does a small bit of processing, and writes them back out
to the same device.

The card is full duplex, but I cannot seem to open a pcm
device for reading and writing at the same time. Even the
"latency.c" doesn't work. Is the driver just broke?

Two questions:

1. What is the best way to accomplish my task?

2. Does anyone have a simple example to do this?

Thanks,

h.