have the selected channels (marked w/ record in proscan
That's for if using the Recorder. If not using the Recorder then you don't need to do anything with this.
I was told I can use the headphone jack as a record out jack like the BCD325P2 does. I would like to listen to the sds200 through the speakers and have the selected channels (marked w/ record in proscan) go to radio feed via a speaker jack
I don't use the headphone jack but doing so may invite problems such as a 60 cycle hum produced from a ground loop. If you do get the hum then you will need an audio isolation transformer. You will also need a stereo cable since the jack is stereo. The mono signal is tied to the left & right channels internally. Other problems such as audio bleed-over, impedance mismatch, mic input too hot, etc.
Since the SDS200 has an Ethernet connection and ProScan(and my free RadioFeed) supports that, the audio will be crystal crystal due to the audio digital signal all the way from the scanner to ProScan.
To hear audio out of the computer speaker, go to the Audio Control - Monitor & Test tab then choose the audio service using then check the Loopback box. If not using an audio service then just pick any.