chi ball wrote:

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When you send MIDI into pd, what do you expect to happen?

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MIDI coming into pd will not make any sound, it will provide messages to control things that make sound, if you build them or load them.

In "testtone" there is a midi test.......a little patch.. ;)

I am familiar with the testtone patch, but the word 'mute' threw me off, because MIDI does not cause sound to occur in the testtone patch. Which MIDI api are you using?

I don't know..

Excuse me for my english..mute means that if I make a simple patch to produce a midi note with a metro.. (I'm familiar with algorithmic music in pd, but in windows..) I can't listen anything.

Audio and MIDI should be separate here. I recommend using jack, and for that to work you need jack running as the same user that is running pd, and make sure that the pd output is connected to your sound card (this is easy to do with qjackctl). See if other programs can make sound with jack. For AlSA sound, make sure that no other program is hogging the sound card and preventing pd from using it. For MIDI, use ALSA MIDI, and you can manage MIDI connections also in qjackctl, under the connections-alsa tab.