Thanks for the correction, sorry for the misinformation.
That MCU would not sample like an audio ADC, no need for the purpose. Precise value is already sampled by the soundcard. If an approximate value were needed on the PC side, outside of the analyzer, a few samples a second behind some AC/DC to hold peaks (somehow already present in the device for the existing MCU) should be easily attainable.
But again, the ADC is not point of this. I just wanted to suggest one way towards enhancing existing devices with simple remote interface without complicated modifying their firmware, if possible.
That MCU would not sample like an audio ADC, no need for the purpose. Precise value is already sampled by the soundcard. If an approximate value were needed on the PC side, outside of the analyzer, a few samples a second behind some AC/DC to hold peaks (somehow already present in the device for the existing MCU) should be easily attainable.
But again, the ADC is not point of this. I just wanted to suggest one way towards enhancing existing devices with simple remote interface without complicated modifying their firmware, if possible.