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In this project I wanted to control a Roland Super JX-10 with an editor, but I didn't want two displays and duplicated controls. The JX-10 and MKS-70 have an internal assigner board, it's the heart of the synth, it basically controls every aspect of the synth, midi, front panel controls, screen...

With an mcp23017 you can add 8 encoders on 2 wires. Upto 8 chips for 64 encoders, 128 buttons or leds

You know what I mean, 1024 possible positions, yes you can hear stepping on some synths when you use 7 bits resolution effectively cc, using at least 8 bits gives you smoother controls. Listen to an m1000 being controlled over cc.

Having 7 bits is no better than cc control though is it which the OP wanted to get away from. So the resolution is super low. To get better resolution like 512 or 1024 bits is harder but gives you better resolution and less stepping.

Cc is limiting in 2 ways, only about 120 usable parameters and also only 0-127 resolution which some people find a bit stroppy. Direct control with pots is better even if you only use 256 steps as doubles the resolution. You could use NRPN which increases the controls to a max or 16384 and of...

I was just looking at a supersaw build myself, my plan was to go Pico per DCO and feed analogue filters, I wonder if I could build your front end and attach it to a CS42448 TDM board for 8 individual outputs.

I hope your project turns out well, I would like to have a go at building it if you finish and publish the build.

I always use RK-09 10K pots of some type or other when I build with pots, my current project is using sliders and pots and I get a little jitter just on two of them at mid way point, a bit annoying as these are tuning related pots. Anyway I moved away from pots and sliders to encoders where...

If you use encoders and lose the sliders then you can get a really stable interface, I used to use pots all the time, upto 128 in one project, noise is always a problem. I try to use encoders attached to mcp23017 chips now, it just uses 2 lines (i2c) instead of multiple address and input lines...

I have updated my post, first time posting code

I can't see anything obviously wrong with it, I'm curious about why it has so many connections between the audio board and the Teensy, also your note handling routine isn't that great which might be causing it to crash, really you need a better way to handle on/off notes and only play free ones...

Do you have a link to this creature

I tend to agree a sync function is missing from the oscillators. Would be nice to have. This synth although it's turned out well was more of an experiment than anything else, it gave me an opportunity to use the audio library, maybe not extensively, but I learned a lot. The analogue filter/VCA...

I got stuck into it again this evening and added polyphonic and monophonic glide, the xmod encoder can switch between xmod depth or glide time.

This was my first attempt at an 8 voice poly using the Teensy Audio library, I wanted a stable front end for the DCOs but real analogue filters, so it's a hybrid. The Teensy 4.1 takes care of the three DCOs per voice, two LFOs, pitch envelopes and a noise source. The outputs of each three DCOs...

Can you use i2s on its own as test to see if you have audio, just a simple sketch that outputs a tone to the i2s device? You might have more luck with the pcm1502 than the uda1334 as an i2s device, in my last build I had to replace the uda1334 with a pcm1502 i2s device to get the audio to work...

Another Teensy 4.1 based synth/control

I don't know if this counts but it's running a Teensy 4.1 as the synth editor/controller.

I loaded all 4000+ into PSRAM in 63 banks.

Here it is in its completed form, always nice to get the clothes on.

This is my current Teensy Audio Library build, my first Audio Library build. I'm using a Teensy 4.1 & a TDM board CS42448 to generate 8 outputs that are sent to 8 multipole analogue 24dB filters. These are then merged into a mono signal for the FV-1 effects processor before leaving on stereo...

I've sort of fixed it, I removed some cheap chinese hubs from my system, added what I think is a working hub, moved that Teensy to the hub and ut seems to work, Don't you just love windows.

Cheers, Only thing I can be sure about is that I have been programming both devices for a week or so with the same cable, moving it from one to the other, now I cannot see the display one it's hard to tell you anything else, I can program it, the red light flashes when I press the program...

So I've been working on a project with a couple of Teensy 4.1 devices, one controls the displays (9 of them) and one controls the synth. Yesterday the Teensy 4.1 that controls the displays refused to be seen by Windows 10, just not in the drop down and I get Winowd USB device not recognised...

OK, I set MYPSRAM to 4 to allocate 4MB and I tested the jerky display and now its smooth, I will carry on testing with all displays using the PSRAM

Hi Kurte how would i go about using the PSRAM for the framebuffer, i have 8 displays attached to my T4.1 but the first 3 are ok and the rest are jumpy, I think Ive maxed out the framebuffers, but I have an 8mb PSRAM chip installed.

I need a little help, I'm trying to connect upto 8 ST7789 IPS displays to a Teensy 4.1. so far I have 4 connected and they all initialize ok, but the first 3 run smoothly when updating, but the 4th is jumping when updating. I think I've run out of framebuffer space after 3 320*240 displays...

Thanks Mark Thats fixed it, wonder why I never came across it before, I have about 6 or 7 multi channel analogue MUX designs under my belt.

Help wanted with a MUX, I have an issue with a 72 channel MUX, it seems to have a problem on the range 0-127 at between 62-66 there is a pronounced jump, whereas 0-62 is fine and 66-127 is fine, but exactly at this half way point I get this jump which is annoying as it is where sliders need to...

Ok, thanks, I will test it in the morning

But frequency count does not work on a T4.1, it's not supported, although according to the blurb it is and countmany is just a .ino file according to the GitHub

It's a squarewave output of a vco, I have PWM control of it so I can vary the width. The voltage is 0-10v but I fed it through a voltage divider and Schmitt trigger to get a 3.3v pulse.

Recently I started adding autotune to a polyphonic midi to CV. I was looking at what libraries are available and there seems to be several. First I tried Freqmeasure and it didn't work, took a short while to realize it's not been developed past Teensy 3.2 and I'm using a T4.1. I think the same...

I can see a clock on the MCLK line, more of a sinewave but symmetrical in appearance. I have loaded another test sketch which plays a sinewave with alternating frequencies and this works on sound card 1, so I'm confident in my wiring.

#include <Audio.h> // GUItool: begin automatically generated code AudioInputI2SHex i2s_hex2; //xy=190,343 AudioOutputI2SHex i2s_hex1; //xy=431,344 AudioConnection patchCord1(i2s_hex2, 0, i2s_hex1, 0); AudioConnection patchCord2(i2s_hex2, 1...

I hope this is viewable, although I have 3 cards attached, I've only shown 3

Hi Paul Yes, that's the code I'm using with changes to the setaddress line to setwire, but even without the changes I would have expected card 1 to work. Also I tried an I2c scanner sketch and it couldn't find any cards which I thought was a bit strange. I will make a schematic and post it up...

I've got 3 boards wired up on each I2c output using the modified audio library that can address wire, wire1 etc and although everything compiled when I'm using the test code created by Paul recently no waveforms are generated. I guess I should just try and get sound out of one card first.

Thanks for the offer, very much appreciated. I think I have enough to be getting on with just to keep me busy here.

Thanks for the information, having a hard time with Putin and his missiles at the moment, but I will try and knock up a board tomorrow.

I will try to locate the boards as close to the Teensy as possible.

Thanks Kurt, I think I saw something posted by Paul showing a demo of multiple outputs for at least 2 cards. I will build a little test board with sockets for everything so I can mod and change as I need.

So I want to create 6 to 8 individual 16 bit audio outputs from a Teensy 4.1, my idea is to create a 6 voice oscillator board similar to the TSynth but with the dual VCO section only created with the Teensy. Problem is that I only have 4x Rev C cards left over from other projects and as I will...

You can use your existing TSynth to edit the headless ones. I'm pretty sure the TSynth sends out it's controls over midi and usb, so if you connect your TSynth to the USB host port of your rack versions it should be possible to edit them.

This is my Tsynth (Headless, all editing over USB or MIDI).

Having spent part of the day looking at this again, the Teensy 2.0 is not capable of supporting 6 DAC's with 6 gates and MIDI input, simply not enough pins to connect everything. So I migrated the code as much as I could to a Teensy 3.5 and added 3 more channels and 5 pin DIN midi in using a...

Looking at this project a bit more in depth, it is 3 channels monphonic, where as I'm looking for a Polyphonic MIDI to CV converter, maybe too much required to convert it to 6 channels poly with 5 pin DIN midi.

Hi, do you plan to release the schematics for this impressive project

Thanks for the reply, much appreciated. I can probably build it ok, analogue and digital circuits are not a problem for me, I've been in IT for over 40 years mainly in hardware. I would say add three more DACs to the circuit and the MIDI in with onto Isolator. Coding is another matter, its...

Nice project, do you think it would be possible to expand it to 6 note polyphonic, I have a teensy 3.5 available for the extra pins etc. I don't need the pitchbend as that is handled elsewhere, but Pitch, velocity and gate for 6 notes would be awesome, looking at the code it seems fairly easy...