[Elecraft] Audio output routing confusion

[Eric Rosenberg]

After 6 months off the air, I find myself confused by the K3's audio 
output choices.

While I'm able to hear the Main A VFO and Sub RX VFO through my one 
speaker, I can't figure out how to (or if) hear both the Main RX A and B 
VFOs through that speaker.

Is there a way to configure this, or do I need a second speaker or must 
I use headphones?

Thanks & 73,

Eric
W3DQ