Not an easy task at all. The RS232 interface on the Orion isn't meant to 'live' control the units operating frequencies, quite unlike most scanners.
However, it may be possible... using the HDT test mode, it is possible to send simple commands to an Orion to set the receive frequency. I don't think its as simple as sending the one command to set the receive frequency either - I think several commands need to be sent, one to set the frequency, one to open the speaker, one to close the speaker at the end of the transmission. There's probably more that is needed that I can't think of at the moment.
Etrunk would need a bit of a rework to be able to 'talk' Orion HDT commands, and to also perform an action (ie close the speaker) at the end of each transmission.
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