A fellow DIY member was building the TeensyPoly6 build that I made a few years ago with a Teensy 3.6 and a sound card. As he was redesigning it to run on a Teensy 4.1 I got involved and half way through decided that the best way to help was to upgrade my synth to a T4.1 so we were on the same page. I had issues with the sound card being a UDA1334 and just making white noise on this build, so I switched to a PCM5102A board and that resolved the sound issues, also increased the polyphony from 6 to 12 voices .
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Ooh, I didn’t know this was based on Nyström’s synth. I looked into it a while ago but, well, teensy 3.5 availability.
Thanks for making an updated version, I have added it to my “to build” list. 
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i have had a teensy on the shelf with audio board for 4 years, must do something with it
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Same here but I think I scrounged a 3.2 for the Notes&Volts Teensy synth project and got sidetracked by some experiment I was also doing in Pure Data trying to model a diac. It’s amazing how one little distraction can fill the parts drawer with the unclaimed and unused.
JFDI mate.
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I have a bunch of small boards for various ideas that never materialised. Specifically 4 daisy seed boards and a development platform.
I think I’m one of many with daisies in their drawers
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I have only 2 unused Daisy Seeds here.
I had such plans but underestimated the size and irresistible allure of the junk in my drawers*.
(*At this point you may insert your own, culturally appropriate, emoji representing a juvenile snigger)
There is a design though, again in a plethora of paper notebooks; one will be a dedicated part of my guitar rig for fx and sequencing experiments (using a Pi Zero W as a headless interface) and the other I’m mounting as a general dev board attached to the pc I use for Pure Data and other sound design nonsense.
Ah, one day! Best to all.