> Basically nothing supports hardware mixing these days except the
hmm... alsa soundcard matrix lists pretty much cards as "hardware
mixing supported". there are devices on yamaha YMF7xx, trident 4DWave,
motorola 56361, aureal AU88x0, TI TMS320C67xx, and some others. so,
hardware mixing seems to be supported on echo cards (motorola 56361),
and unsupported on m-audio cards (envy24).
> For professional audio use hardware mixing is basically irrelevant