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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      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:
      • TGX4-AKvsWM.png
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      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...
      • TGX4pcb4.jpg
      • TGX4pcb5.jpg
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      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...
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Boards arrived, now let's hope there will be no or minimal need for bodges.
      • TGX4pcb3.jpg
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      I took the Waveforms Audio example, set the frequencies to 1000Hz, wave type to sine, and maxed the levels with sgtl5000_1.lineInLevel(0); sgtl5000_1.lineOutLevel(13); And looked at the line outputs with my QA403 audio analyzer: Which...
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      KiCad + FreeCAD. I think this will be the final configuration i'm going to build for myself:
      • TGX4_3d6.jpg
      • TGX4_3d7.jpg
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      Pio replied to the thread Creating arbitrary waveform.
      One crude way of resample it would be to simply use a DC component and update it from whatever the sensor source is. DC outputs the same value until changed. Maybe add a lowpass @ 2kHz if the input f is around 4kHz.
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      Pio replied to the thread Creating arbitrary waveform.
      Have you tried to generate a whole buffer (4*128) or even a single 128 words block of samples at once and only then play it?
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Diecast boxes are pretty much standard for the stompbox builds. AK4552 vs AK4452 - of course that was typo, i mean the 32bit 4452. The volume pot will fit, tested many times in practice, the 3d model is not the type i'm going to use, i've just...
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      • TGX4pcb2.jpg
      • TGX4_3d1.jpg
      • TGX4_3d2.jpg
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Thank you! Hardware platform is in the works, i'm trying to make it versatile and mod friendly: Teensy4.1 AK5552 + AK4552 ADC+DAC can be replaced with a separate module containing a codec + whatever it needs. I2S, I2C, differential ADC input...
      • TGX4_PCB.gif
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      From the AudioFilterStateVariable description:
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Oh, please, any fixes are welcome. Meanwhile, a track i have been working on for a few weeks. All sounds are made with using this project on T4.1+WM8731, some post processing is used on the mix, nothing too drastic, though.
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Version 1.4 dropped in including: new way to define and add hardware platforms. Minimal is now a standard T40 + Audio Adaptor Board pre built hex files for T40 & T41 + Audio Board added ES8388 codec (i'm quite disappointed with this one, but...
      • t40_ES8388.jpg
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      Pio reacted to Expensive Notes's post in the thread Dalek Synth with Like Like.
      I modified a toy Dalek I was given (its original function was broken) to become a bespoke synth. Here is a demo of it, version 1. The internals include a Teensy 4.1 and Audio card.
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      I mean 32bit converters are a bit an overkill, but also a chance to play with them (literally too). Guitar signal with all the playing techniques is very dynamic. Plus the high gain - i'm curious how will they behave combined with the neural amp...
      • sgtl5000_wm8731_noise.gif
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      This is what i'm getting, no calibration done, peak values taken for all gain settings (0x00-0x1F) over a 1 sec step between them. ADC is not muted internally, only the input audio via the jack contacts, there is an opamp buffer before the ADC.
      • WM8731_PeakBias_1s.gif
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Here is an interesting comparison: feedback + noise on high gain (Lead2 + Boost used to cut low end only) for the two codecs: SGTL5000 + WM8731 Granted, the WM8731 on my board has a separate Vreg for the analog 3.3V rail and a lot more uF on all...
      • SGTL5000_vs_WM8731.png
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      git pull the library? Or update the dependencies in platformio, it will pull the latest changes.
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Yes, it will be designed from scratch. Well, almost, i'll use whatever i learned from previous builds. I have a sneaky plan which might work: design the pcb with the codec being a kind of module on the pcb - original can be cut off, removed and...
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      It's just another reason to start a dedicated hardware design. These are the settings for the SGTL5000 i'm using now: codec.inputSelect(AUDIO_INPUT_LINEIN); codec.volume(0.0f); codec.micGain(0); codec.muteHeadphone(); codec.lineInLevel(0)...
      • TGX4_HW_0.jpg
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Working on the simpler version for Teensy4.0. I do have it with a SGTL5000 codec, default input gain it too much for a guitar. I think i copied it from an example. LineIn gain is is set to 10, but 5 is the optimal value - tested with a 7string +...
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Maybe something went wrong with the default settings/presets written to eeprom on the 1st boot. Please try the following: - open the stats.cpp file - in the stats_init() function, line 51, change statsMode = STATS_MODE_INFO; to statsMode =...
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      The sound is a direct recording from Teensy/WM8731 into a mixer, no post processing at all.
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      https://github.com/hexeguitar/TGX4 I have added one more HW configuration: for the Blackaddr TGA Pro board. I don't have one to test, but would be great if anyone could try the included in the bin folder precompiled hex file. There is also one...
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      The gumstick-sized Teensy 4.0 made this project possible! Fender's iconic Stratocaster's control cavity was routed to accommodate a few analog pots and a dual-pole 5-position blade switch but I've crammed the Teensy, a stereo codec, two RGB LED...
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      I'll answer myself and maybe it will be useful for others: it's because of the two blocks queue used by the i2s output to populate the DMA buffer.
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Soon, i went into the latency rabbit hole trying to optimize it a bit, but it would require a new audio system.I'll leave it for now. It's perfectly usable and playable. I think i'll add a master high pass filer, have it on my second IR cabsim...
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Booster just got a new feature: emulated analog octave up: https://streamable.com/yjlghm
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      A short sound sample using the Delay in Freeze mode to create a stereo sound layer + playing over it with one of the Crunch Sounds + Plate reverb, later on adding modulation to the delay loop. https://streamable.com/0cyd6i (can't embed...
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      There is a way to add/use different impulse responses, but i haven't gotten to test it thoroughly yet. I have made a python script that converts the wav files into c arrays. Will be added in the foreseeable future. If you want to play with it...
      • TeensyGuitarAmp_v1_3.gif
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      Problem description: I have noticed that if some of the components do exceed the max allowed execution time in the audio ISR (load goes over 100%) the overall latency is increased and stays increased. That is - it is enough to do it once and the...
      • DS1Z_QuickPrint14.png
      • DS1Z_QuickPrint15.png
      • DS1Z_QuickPrint16.png
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Following the world's best version control practices i'm finishing working on the final_final version of the Amp Emulation. The number of controls started to grow rapidly, i decided to split them into 3 tabs: 1. Amp: New items are: - Input...
      • T41GuitarFX_amp.png
      • T41GuitarFX_delay.png
      • T41GuitarFX_reverb.png
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      Pio replied to the thread 1830 Hz noise when there is no input.
      I have encountered this issue, it's not really Teensy related, but the SGTL5000 codec chip. I was able to narrow it down to a resonance happening due to impedance of the capacitor combo and the SGTL5000's analog power supply pin resulting in a...
      • teensy4_audio_pins.jpg
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      Just wondering, this looks a bit too ideal (full 3.3V scale, pulse shape) to be a crosstalk. Have you checked the CS lines with a continuity tester if there is a short between them and/or a different signal? If everything worked as a prototype...
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      It's MIDI, so the raw values for CC are always 7bit int, 0-127. Look at the CC receive callback. It's converted to float 0.0 - 1.0 there. Dials are set to show 0-100 range instead of raw midi value. This can be changed in the html file. More info...
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      Pio replied to the thread Stereo guitar/bass cabinet emulation.
      Nice build! The difference between an unbuffered (LoZ, under 100k) and bufferred input (>300k-1M) won't be very drastic, usually it's the top end where various overtones live. With clean sound it might be only slightly noticeable. With...
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