On Wed, 23 Sep 2015, amin...@gmail.com wrote:

>     It may not be called "device ID" in alsa-seq but my question is how 
> to distinguish between midi events that came from different sources.

In Event.T there is a record field called 'source' that has the type 
Address.T:
    
https://hackage.haskell.org/package/alsa-seq-0.6.0.5/docs/Sound-ALSA-Sequencer-Address.html#t:T

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