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Welcome to the group!!!

Have you tried sending CC 07 with a value of 127 to see if the midi volume is turned down all the way A reset may cure this also.

After that I would start looking at the +/- 12 volts to make sure the analog section has enough good voltage to run. Does the volume pot affect the sound. If it fails the output will be missing.

Then I would start following the circuit through to the 4053 mux. A simple audio input lead to a mixer with a 10k resistor can trace the audio path to see what is missing.

HTH, Fran

On Sunday, April 20, 2014 9:35 AM, "zc40@..." <zc40@...> wrote:

Hey guys great group, I like a lot.

I ask.

I have a 1000 matrix recently,

The ignition and all good, but the preset does not have sound, some preset sounds, but very low volume and bad. Believe that chips voices were good, I thought something in common, such as the 4053 ... but I'm not sure is the fault.

Thank you all. Greetings.

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