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"Mic-in" or "Line-in" on Leopard Board dm368

Hello everyone!!!

I'm using Leo368 with TI SDK. I'm currently test audio input soure.

I using simply command as below:

gst-launch alsasrc ! alsasink sync=false
I need to talk to Microphone and heard my voice in Speaker, but no sound!!!.
and I get output console:

gstbaseaudiosrc.c(822): gst_base_audio_src_create (): /GstPipeline:pipeline0/GstAutoAudioSrc:autoaudiosrc0/GstAlsaSrc:autoaudiosrc0-actual-src-als:Dropped 8820 samples. This is most likely because downstream can't keep up and is consuming samples too slowly.

Schematic for audio input: http://designsomething.org/cfs-file.ashx/__key/communityserver-discussions-components-files/33/8105.Leopard_5F00_368_5F00_Audio_5F00_Line.png

and my problem as same as http://designsomething.org/leopardboard/f/33/t/431.aspx.

I guess I need to make a hardware circuit that input can receive my voice and output will connect to Mic-in on Leo368.

anybody can give me some suggest??

Thanks a lot!!!