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miro alsa driver
Since ALSA version 1.0.9rc2 you can use your miro soundcard with ALSA, too. The miro driver supports the miroSOUND models PCM1 pro, PCM12 and PCM20 radio. By the way, the miroSOUND PCM10 is different and shall work with the standard OPTi9xx driver opti92x-cs4231 of the alsa package, because it comes without an ACI mixer.
Unfortunately the miro driver isn't in the kernel, yet. So you have to install the alsa-driver package if you want to give it a shot.
miro soundcard links
ALSA project and ALSA bugtracker
mirosupport for Miro hardware
miroSOUND PCM20 radio
miro pcm20 radio patches
Here are some experimental patches. They will offer radio support for your miroSOUND PCM20. This driver depends on ALSA and V4L2, instead of the original one which is based on OSS and V4L. These patches are written for kernel version 2.6.x. RDS support is still missing. Nevertheless you can use your card with kradio, but gradio will fail. Please read it as experimental snapshots, which aren't rock solid yet. Further improvements will follow...
miro pcm20 radio patch v0001 (patch for kernel 2.6.19.2)