On 1/27/06, Rob Robson wrote: > > Any audio engineer worth his or her salt tests a mix for mono > compatibility > by summing left and right. The only case I've ever encountered where > summing caused nasty artefacts involved old mono-reprocessed-for-stereo > recordings that had been fed through the MPEG-2 "joint stereo" > codec. Short > answer: two resistors or a simple op amp summing amplifier should suffice. Many FM stations still broadcast in mono, but they send the stereo subcarrier so that your radio won't ignore them. scope the channels some time! Definitely a simple resistive mixer should do fine here. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist