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And here are a few more videos of my TeensyMIDIPolySynth in action: (as a clarinet sound) : https://youtu.be/ka2uaDPyMTs (as a accordion sound) : https://youtu.be/p1xfJp7eug8 (as a hammer dulcimer sound) :...

You should be OK. The two rectangular pads are VIN & VUSB. They are connected to each other with a very fine trace, which is there to allow cutting in case you want these two supplies connected independently. I...

Here's a dirty hack that might help you to test in the short-term: - if you're on a Windows machine, rename the offending "Wire.h" file (to something else, maybe oldWire.h") - in place of the previous "Wire.h",...

SteveC78: With the two lines ("long positionLeft = -999;" & "long positionRight = -999;") inside the setup() function, their scope (where they are allowed to be accessed) is limited to only inside the setup()...

I have posted a pseudo schematic for the TeensyMIDIPolySynth which shows the interconnects between/among the Teensy / MUXs / shift registers. It can be found by following the same link referenced earlier...

I have posted the pseudo schematic. You can find it by following the same link referenced earlier. Good luck & have fun !! Mark J Culross KD5RXT

A link to the source (located on my GoogleDrive) is available from the project link given earlier (TeensyMIDIPolySynth (https://forum.pjrc.com/threads/60690-TeensyMIDIPolySynth?p=237404&viewfull=1#post237404). I'm in...

You can use the Teensy + 74HC4067 16:1 analog MUXs + 74HC595 shift registers to create your own. That's the combo of hardware I used in my TeensyMIDIPolySynth...

My TeensyMIDIPolySynth continues to evolve (now up to firmware version 4.2 & counting). The LED drive conversion is complete & working very well. Formerly, the LEDs were driven from the MUXs. That turned out to be a...

@Frank B: Did you actually look at the post that was linked ?? If you did, you would clearly see that it includes the import text which shows the problem (at the top) & the import text which can be used to work...

@PaulStoffregen: Here's a post relating to the "wires is null" error that can be experienced when using filters in the Audio System Design Tool for Teensy Audio Library GUI. Maybe it has an easy fix . . . any chance...

Take a look at the following post to see if the workaround suggested might work for you: https://forum.pjrc.com/threads/60859-voice-like-a-pilot-(?p=239080&viewfull=1#post239080 Mark J Culross KD5RXT

flashburn: In the early design of my TeensyMIDIPolySynth (https://forum.pjrc.com/threads/60690-TeensyMIDIPolySynth?p=237404&viewfull=1#post237404), I ran into the same GUI bug. I found that if you throw in extra...

Pete: Thanks for the pointer . . . I will have a look. I found the audio library very easy to understand & even easier to use in implementing my TeensyMIDIPolySynth. If I succeed in the modification, it will make a...

Where would I find the source for these audio library objects ?? It might be above my pay grade, but I thought I'd take a look & see if I can understand enough to create a StringModulated object myself.

toutant: any luck w/ disabling the high pass filter ??

I don't know how fast you need/expect to sample your digipots. On the subject of propagation delay & transition time, in my TeensyMIDIPolySynth project, I am *reading* 48 pots & *reading* 42 pushbuttons, as well as...

Has anyone been able to reproduce the steps in post #3 & verify the same unexpected results ??

Anoat: My experience with the 74HC4067 was good. It may not be the best choice of the three (only you can decide what "best" means for your application), but it will certainly work. If you do use it, make sure to...

FinleyOderSo: Sorry, I overlooked the "GRB_colors.h" file . . . that was my local rework of the "RGB_colors" file for the GRB color order used by the WS2812B strips that I have. On the subject of library versions,...

Anoat: You might also take a look at the 74HC4067. It is usually listed as an "analog MUX", but it passes digital signals bidirectionally as well. For 5 pins (common in/out + 4 address decoders), you get the...

FinleyOderSo: I am no expert on WS2812B LED strips, by any means, but I do have three 10-meter strings of WS2812B LEDs strung together & hung around the underside of our back patio, all being controlled by a Teensy...

Anomalous observation: return values from AudioProcessorUsage() & AudioProcessorUsageMax() seem to rollover (start back over at 0.0) above about 60.71 Hardware required: Teensy 4.0 + Rev D Audio Shield Arduino...

toutant: For reference, here's the actual SparkFun 16-channel Analog/Digital MUX Breakout part: https://www.sparkfun.com/products/9056 When the MUXs were back-ordered, I've also bought the components...

toutant: In looking at other projects before I got started, "rats nest" can be applied to many/most of them. But hey, no need to look inside the box after it's all done . . . for me, function always wins out over form...

Looks like a fun project. I have recently completed my TeensyMIDIPolySynth (https://forum.pjrc.com/threads/60690-TeensyMIDIPolySynth). On the question of analog MUXs: I made use of the SparkFun 16-channel analog MUX...

RABB17 & XFer: Many thanks to both of you for the LittleVGL recommendation. I was not previously aware of this capability. I guess I know what I'll be playing with next !! I've been toying with the idea of an...

I agree that the TFT would be a great addition (again, yet another reason why I need a bigger box !!). I did originally include that in my plans when I first started into this project. I have used the Adafruit 2.8"...

Now for the question: are the return values from these two functions actually float, or are they int as indicated on the website ?? I am seeing an anomaly when I read/treat them as float . . . the return results seem...

I should clarify the 2nd paragraph as follows (the first & third paragraphs stand as they are): As part of the design, I make use of a DC generator as one input into a mixer. This mixer then feeds the modulation...

Nubie: Sustain is a *level* control (*not* a *timing* control), which specifies the volume level to be be held from the time decay completes until the time that the NoteOff is activated. If Sustain is set to 100%...