#include <Arduino.h>
I changed to a cap A in Arduino.h to get it to find the header in the libraries I have which are from

https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json

Don't know if you should change code but comment perhaps. Also delete this issue if this is silly. I know some others are trying to follow your work and get this to compile so if this helps ...

If I understood correctly, this repo's purpose is to send midi messages from the microcontroller to a computer via USB.
At first sight, I thought that this code enables receiving midi messages from a Keyboard to a microcontroller via USB.

It would be nice to put this information more explicitly in the readme.MD (from what to what).

I'm opening this issue just trying to help, you make a wonderful job, keep going.
I'm trying to gather some time to put my hands on your code and make some POCs.

Hi Marcel (hope that's ok for name),
you owe nothing but as set up from downloading this library which I just initially want to test my USBhost midi - this analogue mux thing - i don't have one. So I'll simplify this to get to where it works but fyi .. can't compile. Maybe you need to add another file to the respository here?

//In this function -- analogSetCycles(1); error in arduino IDE - 'analogSetCycles' was not declared in this scope

void AdcMul_Init(void)
{
    for (int i = 0; i < ADC_INPUTS; i++)
    {
        adcChannelValue[i] = 0.5f;
    }

    memset(lastSendVal, 0xFF, sizeof(lastSendVal));

    analogReadResolution(10);
    analogSetAttenuation(ADC_11db);

    analogSetCycles(1);
    analogSetClockDiv(1);

    adcAttachPin(ADC_MUL_SIG_PIN);

    pinMode(ADC_MUL_S0_PIN, OUTPUT);
#if ADC_INPUTS > 2
    pinMode(ADC_MUL_S1_PIN, OUTPUT);
#endif
#if ADC_INPUTS > 4
    pinMode(ADC_MUL_S2_PIN, OUTPUT);
#endif
#if ADC_INPUTS > 8
    pinMode(ADC_MUL_S3_PIN, OUTPUT);
#endif
}