Pio

GUI work is so time consuming... Expression pedal controlling the wah and updating the corresponding slider on the display: https://streamable.com/1jml92 BOOST section is renamed to PREAMP and contains wah + boost + octave up now. Also the...

Audio Shield has 2.2uF decoupling capacitors present on the Line input L & R. It is safe to run the DC output of the MEMS board to either Line input L, R or both. AC output of the MEMS board will also work. In this case the effective decoupling...

More work on the Wah section: the implementation is based on the work by Transmogrifox https://cackleberrypines.net/transmogrifox/src/bela/inductor_wah_C_src/ adapted to the current TGX4 workflow (mono processing, bypass is stereo) and with a...

@tomas Thank you! It's been a journey and i think it will go further. Having the tested hw base i'll try to run the NAM models on Teensy next. While researching this topic lately i found a few PCB pics of the IK ToneX pedal, which, surprise...

The 3 band tone stack (AMP section) is independent and always on. There is also a global high pass filter at the end of the signal chain. I need to somehow squeeze the wah into the gui now. I think i'll change the Booster tab to "Preamp" and it...

What this project was still lacking is a decent wah, not only for the usual "quack" sounds, but also as a pre EQ tone shaping tool. Adding it now. I'm not after modelling any specific models, but rather using one as a starting point and tweak it...

I'm still deep in the GUI(ESP32) - Teensy integration. Preset System: supports up to 128 presets (if SD card is present) or 8 if using EEPROM only. EEPROM is still used to hold the 1st 8 presets. Acts like a backup copy, SD cards can fail...

Maybe this will help - undef the compiler flags in the platformio.ini file https://docs.platformio.org/en/stable/projectconf/sections/env/options/build/build_unflags.html

Also disabling the interrupts globally within the update/triggerGrain, which happens inside the audio interrupt is probably not a good idea.

Before the ESP starts to talk to Teensy i wanted to see if everything works when put together into the enclosure, check the current consumption. Teensy + ESP32S + Display (not using any wireless connectivity yet) draws about 217mA from a 9VDC...

Thanks! Noise/oscillation issues are almost gone with the AK converters. I have used the stencil + solder paste and human pick&place. For placing the components i use either tweezers (larger components) or a vacuum pick up which i designed...

WebMIDI (fx settings) + WebSerial (console + status report) in the browser, MIDI+Serial over USB for the Teensy. The GUI on the pic above is a platformio native linux project for LVGL9.1 which then will be run on the ESP32+TFT. ESP will control...

On the GUI side: there is one main tab with quick access to the most used functions plus preset handling. All sections have their tabs with all the controls from the html page.

and painted, in Melon Yellow :)

Working on the enclosure now. Everything fits as planned. For the light pipes i'm going to use a 3mm round acrylic rods mounted into a LED bezels.

Got the AK5552+AK4452 working with 32bit/44.1kHz. The difference is huge. Practically zero oscillation and much lower noise. Here is a visual comparison of the hi gain preset 5 output, inputs are shorted to GND:

Progress update: populated two boards, one used as testing bed for each circuit block and the other as "final". No major hiccups so far, added only a few changes, nothing requiring board reorder (which was not cheap - 4 layers over 100mm). Also...

Hi Chip, i tried both HPF settings. Somehow i couldn't reproduce the issue on all of my hardware (not using the Teensy Audio board). Although i did have issues with SGTL5000 going into crazy self oscillation, they were power decoupling related...

Boards arrived, now let's hope there will be no or minimal need for bodges.