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Problem solved. 

I used  unsoldered the LED . Re-solder it and used a precision  knife to cleary mark the LED pads .

Many thanks for your help

Many thanks 

Hi,
The Green position is Pink. I'll check the resistor again .A PCB picture  would be appreciate : after soldering, the reference are masked by the resistor itself .

Anyway the sound is so good  despite the pink issue 

What is the miniATmegatron MIDI implementation ? 

Congratiulation the miniArmegatron  is great  . Soldering the LED is quite tricky .   The D2 LED is able to  flash green , but the D1 one  has only a pale pink to offer at the  AMPLITUDE ENVELOPE position.

Is the LED somehow damaged ?