Hi, I have a project, I bought the board ( WAV Trigger Polyphonic Audio Player SparkFun) that can play different wave file thru midi etc…how can I trigger different output wave file depending on the Input level(microphone) or aux Input.
Trying to variably select tracks based on input volume isn’t going to be plug-and-play, you’d need a second MCU in between to translate the input volume into variable outputs that would then go on the trigger the WAVs
Take a look through our guide WAV Trigger Hookup Guide V11 - SparkFun Learn to see more of its abilities…and if your project requires the input volume feature, I’d grab an esp32 or teensy and use it as the middleman 
I’d definitely consider a commercial audio measuring device (VU meter) to bypass a lot of analog audio R&D if you just want to get tracks playing. For example, you could hack into the little lights on old graphic equalizer which indicate amplitude. Select different columns of lights for different tone bands. If you wanted more granularity among different tones, a guitar tuner might be neat to try to repurpose.
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