Hosting AU, a "microDAW" for Mac OS X that hosts Audio Unit synth and effect plug-ins.
It comes with a 4ch+1 mixer with ext-audio input, 24-bit recorder, a "Music-Typing"
kind of feature called "LazyKey".
Backward compatibility is up to 32-bit Carbon-based plug-ins no matter on Snow Leopard
to the latest Mavericks. So most older plug-ins will run.
It's a free download without any limitation.
Download here:: Click
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