Input Module BTM-S

Anybody know what a Peavey Input Module BTM-S is good for?They come in MMA-875t amps , have 3 screws on them 1,2,3, and when I put a FM radio earphone signal on pins 2,3 had hardly any output at all. Pin 1,2 is worse. When I put the signal in the one AUX-IN module with 2 RCA jacks, the amp output was normal volume. That's my FM radio.
I don't have a selection of parts amps & cables anymore, the burglar carried every one off in September in 3 SUV loads. I just received a $30 with freight MMA-800 mixer with 8 AUX-2 modules, and every one is missing the screw adapter that goes over the pins. So I'd like to use the other MMA-875t amp I got for $45 (with freight) with only BTM-s modules to amplify the headphone output of the PC to the $2 speaker I bought at SalvationArmy resale today, but all I have for stereo 1/8" phone plug is wires cut from a dead headphone. No 1/8" to dual RCA plug adapters were at SA. I can buy any cable or adapter I want for $50 minimum from newark or digikey, right after I pay the county tax, state tax, and 2 annual insurance premiums all of which are due between 11/10 and 12/15. So is there any way I can listen to streaming music from WCPE this week that WUOL-FM is talking continuously, without the sound coming at 1/2 watt from a 1.5 cm speaker in the back of the PC? Which is horrid, but not as bad as all that begging on the FM station I already paid my annual subscription to.
 
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