In article <5451b32e.7060...@outband.net> you wrote:
> I feel as if i am overlooking somthing obvious, but..
> 
> Is there a way to list sndio endpoints?
> 

Unless someone has a better idea, I think you need to look at your dmesg.
Look for lines "audioN at whatever". The audioN device should correspond 
to a (r)snd/N sndio device. AFAICT the rsnd/N devices are always 
accessible if a corresponding audioN device is available. The snd/N 
devices are made available by sndiod.

If you have multiple audio devices I think it's necessary to specify them 
in /etc/rc.conf.local in order to make them available through sndiod.
e.g. sndiod_flags="-f rsnd/0 -f rsnd/1" 

> Specifically I was trying to attach a scope(probably one of the ffplay 
> visualizations) to the main output. however I could not figure out what 
> endpoints exist.
> 
> 

I don't know if this is what you want, if I connect my USB camera I'm able 
to get a visualisation by tapping my finger on the camera while running:
ffplay -f sndio snd/1

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