ESP32-A1S with AC101 und USB Breakout

[AlfredR1]

I got the ml-synth_organ_example finally to work.
SW: ml-synth_organ_example with library ML_SynthTools and USB_Host_Shield_2.0-master
HW: Audio Kit ESP32-A1S-AC101 with Mini Usb Board V2.0 (DuinoFun UHS mini V2.0).
Modifications: LED5, Cap 58...61 removed to get proper SPI signals (MOSI,MISO ...)

After some research I found that the signal print on the bottom of the board is wrong and changed signals (as proposed in your comments on Youtube-video)

Problems with USB Shield V2.0
Without 5V connected, serial monitor runs up to "Usb init done , waiting to connect USB". When I connect Evolution eKey49 Masterkeyboard with separate 12V supply, everything works wonderful (test tone and all tones on keyboard)!

As soon as I connected 5V to mini USB the communicaton and operation is blocked ??
After I cut a PCB line from 5V input to 2k2 resistor (found advice on internet and added a schottky diode) I also can supply this keyboard with 5 V from USB-mini and everything works properly.

Now I would like to use my M_Audio oxygen49 (with sliders, buttons...) instead. When I connect this (supply only via 5V from USB possible) the keyboard works (LED on...) but I receive no Midi input signal?

My questions:

1. Do I need additional or alternative libraries (esp_usb_mini_main)?
2. Can anybody send me a schemetic and layout of the pcb-Pins of the mini USB?
3. Any idea why oxygen49 does not send midi signals? (it still works on other hardware)?