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    Here's more about callbacks: ...

    Here's more about callbacks:

    https://github.com/FortySevenEffects/arduino_midi_library/wiki/Using-Callbacks
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    Try using the callback ...

    Try using the callback


    MIDI.setHandleClock(doSomethingAtClock);

    void doSomethingAtClock() { //your secret sauce here }
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    You can set this with a function in the SGTL5000...

    You can set this with a function in the SGTL5000 control code.

    25520
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    2533025331 Well, this is a highly available...

    2533025331

    Well, this is a highly available and common encoder breakout. It may not be what you are using. Some encoders I use only attach to the data pins and ground. This one asks for a...
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    The encoders might well have been the source of...

    The encoders might well have been the source of trouble.

    As for them not damaging it right away... that doesn't seem intuitive.

    At this point, I'll draw back and see if anyone else has any...
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    If those pro minis were 5 volt... they would have...

    If those pro minis were 5 volt... they would have introduced 5 volts directly to the Teensy pins.
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    But to answer your question yes there are ways to...

    But to answer your question yes there are ways to electrically isolate usb devices from the host computer that provide power via an external source. Again, the Jetson is a 5 volt system - I have...
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    I seriously doubt the Jetson over powered the usb...

    I seriously doubt the Jetson over powered the usb system if it still works.

    You haven't told us what, if any, other things are attached to the Teensy that might have failed and shorted out the...
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    This might also be an issue with USB power...

    This might also be an issue with USB power management on the hosting computer, but without more information the only thing anyone can do is randomly guess.
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    My personal experience as a musician is that...

    My personal experience as a musician is that anything over 30 ms latency gets annoying, under 30 ms ranges from acceptable to undetectable depending on context.
  11. As far as I know No, the 6N138 does not work at...

    As far as I know No, the 6N138 does not work at 3.3 v.

    Look at the Adafruit midi feather wing which operates directly with 3.3v logic or consider a suitable logic level shifter like TXS0108E
    ...
  12. This has intriguing potential

    This has intriguing potential
  13. I see you have a mathematical method of matching...

    I see you have a mathematical method of matching a midi note to a specific playback rate. My math-fu isn't that strong but I knew it was possible. Such solutions come to me better when my...
  14. Updated, thank you. I've lowered the number...

    Updated, thank you.

    I've lowered the number of streams in my project to 6 leaving overhead for filters + stuff. Works well.
  15. 8 streams appear to use 70-90% cpu on the T4.1 so...

    8 streams appear to use 70-90% cpu on the T4.1 so I'd say that's a theoretical limit.
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    Seems okay on Raspberry Pi

    Seems okay on Raspberry Pi
  17. Okay, 8 instances of the same file at once at...

    Okay, 8 instances of the same file at once at different playback rates... which is so cacophonous I can't really tell how well it's working. I don't hear any distinct digital errors, no popping or...
  18. So far so good, I've got 4 streams playing the...

    So far so good, I've got 4 streams playing the same file at different speeds, without any glitches or errors. I'm using a teensy 4.1, SD card and a UDA1334 dac. Not sure what the theoretical...
  19. Bookmarked! I look forward to exploring it.

    Bookmarked! I look forward to exploring it.
  20. This is why you never code before coffee

    This is why you never code before coffee
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    https://fortyseveneffects.github.io/arduino_midi_l...

    https://fortyseveneffects.github.io/arduino_midi_library/a00039.html

    Here's the documentation.

    Read the whole thing...you'll thank yourself later.
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    24318 The mic input on the audio shield isn't...

    24318

    The mic input on the audio shield isn't just an audio input, there's a biasing source.
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    The mic input on the teensy audio shield is...

    The mic input on the teensy audio shield is designed to allow easy use of common electret condenser capsules.
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    The MIDI library does a THRU from input to the...

    The MIDI library does a THRU from input to the output by default. You have to shut it off if not needed, or attach the function to a switch or soft control.
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    The chip in the "5$ preamp" is more like $7 but...

    The chip in the "5$ preamp" is more like $7 but it's still a great circuit.
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    I've used these plug-ins. The sound is up to par...

    I've used these plug-ins. The sound is up to par with commercial software but the GUI is horribly resource intensive. I'd certainly give it a try if the code were ported to run on external hardware...
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    After seeing the MicroDexed code, I have given...

    After seeing the MicroDexed code, I have given serious thought to porting the Bristol engine to Teensy 4 / 4.1

    https://sourceforge.net/projects/bristol/

    Admittedly this is a bit beyond my...
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    There has to be an output circuit of some sort in...

    There has to be an output circuit of some sort in order to hear anything.
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    Too many possibilities to enumerate. We have no...

    Too many possibilities to enumerate. We have no way of knowing from your question how you have your project wired, the extent of possible ground loops, and many other factors. Even an external...
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    Try isolating transformers? Like these EI14 ...

    Try isolating transformers?

    Like these EI14
    https://www.amazon.com/dp/B075465YFV/ref=cm_sw_em_r_mt_dp_6GvRFbATQM7FF?_encoding=UTF8&psc=1
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    fwiw here's what the usbHostt36 debug print has...

    fwiw here's what the usbHostt36 debug print has to say with only one of those hubs plugged in



    USB Host Testing
    sizeof Device = 36
    sizeof Pipe = 96
    sizeof Transfer = 64
    power up USBHS PHY...
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    Yikes. I have two of those *useless* units. They...

    Yikes. I have two of those *useless* units. They backfeed the host, and behave erratically.

    Device ID 05e3: 0606 Genesys logic

    I can run the usbHost debug on it, or any other useful test or...
  33. I use a USB ground isolator. Many available, ...

    I use a USB ground isolator. Many available, usually based on an Analog Devices ADUM4160 chip or one of its family. I also give each project a good solid ground plane of sheet copper.
  34. Thanks! It sounds like it should. To me it's...

    Thanks!

    It sounds like it should. To me it's a bit more Synclavier than DX7 and there's *nothing* wrong with that.

    There's roughly 3000 patches in that sd card, which is delightful fun. (...
  35. 21792 21793 21794 Done! Again, nice...

    21792
    21793
    21794

    Done!

    Again, nice work, Holger!
  36. So far so good, nice work! If I run across...

    So far so good, nice work!

    If I run across any *real* problems I'll let you know.
  37. Gah! Nevermind, I forgot to use the pin 27...

    Gah!

    Nevermind, I forgot to use the pin 27 enable!

    * embarrassed *

    It works, thanks for your time.
  38. I used the most recent code on your codeburg...

    I used the most recent code on your codeburg repo.

    Yes, compiled with serial+MIDI+audio, and that all works.

    I refer to usb host that lets the device directly receive a usb midi keyboard. ...
  39. Is the usb host function shut down when teensy 4...

    Is the usb host function shut down when teensy 4 is used? I have Blacketter's breakout and usb host cards on a t4, running your code successfully but the usb host doesn't seem to work. It worked...
  40. Hmmm. I modified the idea in this thread to...

    Hmmm.

    I modified the idea in this thread to use EXTMEM ( scroll down in the thread for audio object files and example code that the snippet below is excerpted and modified from )
    ...
  41. Nice. I just put the delay array in external...

    Nice.

    I just put the delay array in external PSRAM on a Teensy4.1.



    EXTMEM int16_t sample_delay_line[DELAY_MAX_LEN] = {};


    Useful.
  42. I'd be interested in trying this, thanks in...

    I'd be interested in trying this, thanks in advance for your effort
  43. Replies
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    Teensy receiver code written and tested! It has...

    Teensy receiver code written and tested! It has been uploaded to github and the documentation updated.
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    Whoops, forgot one important thing about the...

    Whoops, forgot one important thing about the mega2560 on the receiver. It has to be a board with an Atmel chip for the usb DFU, and you need to grab a mocolufa firmware for it. I can't seem to find...
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    Receiver, soon to be rebuilt with a Teensy 3.6: ...

    Receiver, soon to be rebuilt with a Teensy 3.6:

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    Capacitance touch midi 'key-tar'

    https://github.com/KreoPensas/Platypus

    This is a wireless midi keyboard project that uses MPR121 capacitance touch breakouts, a pair of old XBee radios, a Teensy 4 , a 240x240 pixel ST7789...
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    I love this thread. I know not of this "...

    I love this thread.

    I know not of this " organization " of which you speak...

    Something something cluttered desk cluttered mind empty desk empty mind...

    I'll be honest here...

    21552...
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    I might have to try that as well, at the moment I...

    I might have to try that as well, at the moment I put screen refreshing in kinda wherever, mostly event driven but there's the odd redraw that isn't gated by an event, depends on where the code is...
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    Good question. In all of my audio devices -...

    Good question.

    In all of my audio devices - digital or not - I put in a large sheet of copper connected to ground. This does reduce noise. It doesn't eliminate it.

    I have tried combining...
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    Got it, thanks!

    Got it, thanks!
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