Can (2) inputs damage Axim, Roady2, or Mini Moy Amp?

[mmurphy99]

Can (2) inputs damage Axim, Roady2, or Mini moy Amp?

I have a radio shack female, female, to male 3.5mm stereo jack adapter in the input of the Mini Moy Amp (normaly used for two headsets on one mp3 player etc..) and a patch cord from Axim x50v with Mapopolis running including CF-GPS Card. I have it in the map bag on top of the tank bag. I have another patch cord running from the Roady2 xmradio to the other female jack to the input of the Mini Moy Amp. The output is a coiled cord to my helmet speakers.

As I'm listening to the xmradio when a turn is coming up Mapopolis human voice comes on and announces the street name and turn, whenever this happens the xmradio fades in volume then resumes after mappopolis finishes its directions.

I think this is great it works like a more expensive mixer!

My question is if there can be damage to equipment with the two feeds joined in this way?

Any thoughts on what is actually happening and if it is harmful?