In order to truly, 'daisy-chain', you'd have to have devices who's output ports were truly POWERED output ports. (the kind that can drive an emitter)
I only say this because from my analysis thusfar, it takes a POWERED output port to drive an input port.
Is it possible that a passive signal will drive an input port? I don't know. Gonk can try it if he feels daring. Move that output plug from the Xantech connecting block's output, to the IR OUTPUT of the Outlaw device.
In theory, if a PASSIVE output port (on the Outlaw) can drive an IR input that normally expects a POWERED signal, then the peripheral will work when Gonk aims his remote at his 990, and sends commands pertinent to the device that is strung onto that output port.
Gonk, care to try? Since I've been told NO power comes from the OUTPUT port of the Outlaw, (since it's PASSIVE) there should be no risk to your peripheral device.
E.