Re: [LAD] alsa seq client ids??

Jens M Andreasen wrote:
> > $ aplaymidi -l
> > Port Client name Port name
> > 14:0 Midi Through Midi Through Port-0
> > 14:1 Midi Through Midi Through Port-1
>
> Ome thing I have many times wondered, what is the semantics of those
> Midi Through ports? In hardware those would be replications of Midi
> Input to some other hardware device, and on output you would never see
> them ... Is it supposed to be some kind of Midi Merge or what is it?

The semantics if a Midi Through port is simple: anything received by the
port is also sent from the port.

If you make several connections from other ports to a through port, the
data is indeed merged.

If you make several connections from a through port to other ports, the
received data is copied to all ports.

These ports aren't used that much in practice because any ALSA sequencer
port that allows connections allows any number of them.

Regards,
Clemens
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Received on Thu Sep 13 16:15:02 2007