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One crazy idea might be, us an adruino nano to measure the time with interrups and so on, and send the reesult via I2C when ready. An additional IO can send a ready signal, so the teensy can pick it up

Would the FreqCount library work for you? https://www.pjrc.com/teensy/td_libs_FreqCount.html

have you checked and tried out the "notefreq" method in the Teensy Audio Library? https://www.pjrc.com/teensy/gui/index.html?info=AudioAnalyzeNoteFrequency

The analog VU meters are pretty "slow" compared to the pwm signal. Most probably you need a resister infront the of the VU meter, because they are very sensitive and react with very low voltage and current. a capacitor in parallel to the VU meter might help too. but I don't think you need much...

UI of simple subtraktive synth here are some pictures of the User interface of my simple subtraktive synth

Cool, can you share some pictures, this would be great I have the board running, also the first simple Subtrctive synthesizer is programmed and working inclding a UI on the display. Next step add more knops, sider and buttons to it. and make a lttle video to share

Hi Steve, It supports the Audio Adaptor Board Rev D (for Teensy 4.0). Andreas

Hi, my name Andreas and I am working on an universal Teensy synth board. The Idea is a board with the Teensy 4.1, the Audio Shield, A MIDI interface, a display and some encoders to start with. Via pin headers you can costumize your synthesizer project, by connecting addiononal pots and buttons...