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You're correct in general and I should switch to 74HCT14 in the schematics. The TI part I'm using is 3.15V for logic HI, so it's fine for my design. But in general, you're correct.

Hi Folks, here is the latest work on MIDI interface with 8x14 ports (6 are driven by Flex IO), 4 audio output and 6 Gate/Sync ports. So far I'm impressed what I could pack inside. https://www.tindie.com/products/deftaudio/teensy-41-8x14-1u-midi-and-audio-interface/

You can use Reaper instead and run it in trial mode for what you need.

Hi Paul, Kurt, I need to find a way to switch a pin between FlexIO serial output and GPIO output in run time. For FlexIO -> GPIO I just set a pinMode to OUTPUT and it works as expected. Would you suggest how I can switch from GPIO back to FlexIO?

Of course, Paul, will share this once it's completed. I believe you saw my other kits based on Teensy already? Teensy 4.1 based 8x8 MIDI breakout https://www.tindie.com/products/deftaudio/teensy-41-midi-breakout-board-8in-8out-usb-host/ Teensy 4.0 based 5x5 MIDI breakout...

Awesome, thank you. Just tried it and have T4.1 running with 14 MIDI out ports (8HW + 6 FlexIO):) Everything is going will do more tests for jitter later.

Thank you, Paul. No easy solution for T4.1 get more MIDI ports :( Alt/SoftSerial not supported, while FlexIO is not designed for that :)

Got that, thank you. I missed that the original topic was on T4, so, yes, you had an extra ports on pads.

Hi Paul, Don't want to open another thread on the same subject of getting extra MIDI ports. It's my first experiment with FlexIO with Teensy 4.1 How did you come with this number? Is it based on the target CPU clock? Is it the same for T4.1 at nominal frequency of 600MHz? Are there any...

This would be awesome differentiating feature to Daisy, and I badly need it in at least 4x4 config for my use case. Unfortunately, I also have no experience in USB stack development to help driving it.

Sorry, I decided to check in this thread instead of opening another one. What's the current state of multi-channel USB audio? It seems there are several attempts to make it going, such as in 4x4 configurations, however, they didn't make to the main repository. Is there more work to be done?