[sdiy] Anyone know of a device that does no-added-delay MIDI filtering?

[ASSI]

On Samstag, 4. März 2006 06:26, Bob Weigel wrote:
> Has anyone seen an already existing device like this?
[...]
> Anyway when I say 'no-added-delay'...I mean a filter that doesn't
> delay sending any of the information to the synth that is being
> filtered for.

MIDItemp MT-16X or PMM-88E does what you want and many more things. Not 
available new anymore. They used an ASIC to do the filtering, you could 
easily implement that in an FPGA now. Cheap uC should be good for about 
four MIDI pairs nowadays if they have a good UART and interrupt design. 
You need to delay for at least one single MIDI message as MIDI can not 
deal with runt messages. You can theoretically do quasi-cut-through 
filtering if you can skip bytes in the message queue for the UART and 
the uC is fast enough to modify the bytes in the queue on-the-fly. 
Otherwise it's plain old store-modify-forward.


Achim.
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