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The chip in the "5$ preamp" is more like $7 but it's still a great circuit.

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...

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...

There has to be an output circuit of some sort in order to hear anything.

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...

Try isolating transformers?

Like these EI14
https://www.amazon.com/dp/B075465YFV/ref=cm_sw_em_r_mt_dp_6GvRFbATQM7FF?_encoding=UTF8&psc=1

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...

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...

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.

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. (...

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Done!

Again, nice work, Holger!

So far so good, nice work!

If I run across any *real* problems I'll let you know.

Gah!

Nevermind, I forgot to use the pin 27 enable!

* embarrassed *

It works, thanks for your time.

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. ...

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...

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 )
...

Nice.

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



EXTMEM int16_t sample_delay_line[DELAY_MAX_LEN] = {};


Useful.

I'd be interested in trying this, thanks in advance for your effort

Teensy receiver code written and tested! It has been uploaded to github and the documentation updated.

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...

Receiver, soon to be rebuilt with a Teensy 3.6:

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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...

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...

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...

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...

Got it, thanks!

I have an observation and a question concerning the teensy 4.1 bottom psram pads and the code... in teensyuae41/iopins.h the psram is defined on pins34-37 and the 4.1 psram pads on bottom are...

Bump!

I'd like to see this happen as well.

I'm a fan of having a book on hand.

I found this one to be digestible:

C++ Primer Plus (6th Edition) (Developer's Library)...

I've ordered psram. No guess as to how long it will take to get here...

Got it.

Will attach an audio shield in a bit and start torturing.

Nice jumper wire job!

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Worked for me

Hmmm. I have a Jetson Nano... haven't used it in months... I'll give it a go.

I've raised the upper limits of the Q to 20.0 with no harm. I'd have to say it still doesn't reach levels of self oscillation common to many synthesizers. I'll have to look into reducing/ removing...

It's feasible, but there's a little lag/delay that may not work well for you when using frequency detection and converting to midi data. I have indeed done this myself with aTeensy 4 and find the...

Check this control, it lets you change playback speed.

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Referring to your redacted reply , not sure how line or mic input should matter since you're looping USB through the teensy.

I selected line in because there's no mic hardware soldered to my...

"[ CODE ]Blah blah blah [ /CODE ] " ( omit spaces between brackets and CODE /CODE )

Or hit the hash symbol as pointed to in pic and put yr code between the tags19191

Not getting the same results here. Audio is being recorded.

The settings were all at default as well.
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Got nothing but wild punches for you. The fact that you hear audio "perfectly" out of the laptop headphones says the Teensy is doing the job, the problem at this point is how the computer and...

FYI, splitting outputs is fine so you can



AudioOutputUSB USBOut;

AudioConnection patchCordUSBoutL ( mixer1, 0, USBOut , 0);
AudioConnection patchCordUSBoutR (mixer2, 0, USBOut, 1);

You need AudioOutput USB and appropriate connections

7 years old, still kicking. 19111

@ houston

I'm using a teensy 4 , the impact on ram was no problem.

@ houston, @ jcugnoni

I just tried out the above posted arrays with the waveshaper and audio shield and like them very much. Thank you.

Fwiw I got a non-halting error message about the...

Noted, great, and much gratitude @mjs513!

The device I built one of those displays into was originally run with a mega2560, and despite using parallel mode, redraws were agonizingly slow. In...

The graphicstest sketch compiles for me for teensy 3.5. I'll try this library next time I do any thing to the device.

Yes, I have one of these in a project using a Teensy 3.5

I'm actually using the Adafruit_ili9341 library with it, modifying the Adafruit_ILI9341.h file to the proper resolution... it actually...

while (!Serial)

( I think it's relatively safe to comment out that whole line it's there to halt execution until you open the serial monitor)

I'm not sure but it may be that something in between is taking processor time, possibly in the sensor library, which is trying to provide service to all potential uses.

You might have better...