Scott Dorsey wrote:

msg wrote:

I would appreciate some suggestions for implementing a stand-alone
audio mixer/equalizer box using commodity components, in the shortest
development time at the least possible cost. I am tending to
want to to use four PCI sound cards in an older PIII 1u rackmount
cpu to create a four audio bus/eight inputs mixer, with
four independent equalizer channels. It should be controllable
using an arbitrary protocol over RS232 or ethernet, not require a
resident GUI, nor local mass storage except perhaps flash for program
loading, and won't do any local capture, only audio I/O at 44.1 or
48kHz sampling rate to and from unbalanced line level connections.


Why do you want to do this rather than use an existing device that does
this? There are a bunch of devices like this out there, including a
popular one from Roland that is well-documented.

Acquisition cost - I need to make several of these and can't afford
commercial versions.

snip


Should I be considering some other o/s or RTOS?


If I were doing something like this and I were having to use generic
PC hardware, I would consider RTLINUX. It would be different if the
PC were just a front end to a dsp, though.

Thanks - I'll look at RTLINUX.