HexeFX Teensy Effects Library

Background:

I started to develop a new effects and components for the Teensy Audio Library a few years ago. In the meantime i decided to focus on the variation of the library working entirely on 32bit floating point data (OpenAudio_ArduinoLibrary by Chip Audette), thus all the new components are built ontop of it.

The components included in the library can be divided into a few groups:

• Drivers - used to configure and contol codecs, ADCs and DACs, usually using the I2C bus.
• Input/Output - I2S reveive and send handlers having a few more features than the stock ones.
• Time based effects - reverbs (plate, spring) and delays.
• Filters - EQs, tone controls, special filters like an IR convolver based speaker emulators.
• Modulation - phasers, infinite (Barberpole) phaser, wah emulation.
• Guitar - guitar related effects, like boost/octave, compressor.
• Diverse - small helper classes implementing basic DSP building blocks, like delay buffers, allpass filters etc.

The two main projects as of now (11.2024) utilizing the library are the TGX4 Guitar Amp Emulator and the T-CAB - stereo IR Cabinet Simulator.

Usage

Requirements and dependencies.

The only dependency used in the library is OpenAudio_ArduinoLibrary by Chip Audette.

hexefx_audiolib_F32 can be used within the Arduino by installing it locally from the linked below github repository.

Visit the Github repository page to download the files packed as ZIP or directly clone the repo using the command below:

git clone https://github.com/hexeguitar/hexefx_audiolib_F32.git

Using PlatformIO makes the whole process a lot more easier, it is also my recommended and used method. Both libraries can be specified in the platformio.ini file in the lib_deps section and will be downloaded automatically. Here is a snippet of the lib_deps section:

lib_deps = 
	https://github.com/chipaudette/OpenAudio_ArduinoLibrary.git
	https://github.com/hexeguitar/hexefx_audiolib_F32.git	
    

For more detailed about using the library see the included example projects.

Graphical Design Tool

for the OpenAudio_ArduinoLibrary with the HexeFX extensions.

Most of the effects are placed in the HexeFX subcategory. The new modified I2S components (AudioInputI2S2_F32, AudioOutputI2S2_F32, AudioInputI2S2_F32, AudioOutputI2S2_F32) are placed in their respective categories: input and output.