[MDT] Microdexed Touch PCB

MicroDexed with TFT Touch Display, graphic UI and sequencer

Microdexed-touch required a Teensy 4.1, PCM5102 Audio Board, 320x240 ILI9341 SPI Display with Capacitive Touchscreen and a PSRAM Chip for custom samples.
Since 08/2024 the previous used serial Flash Chip (on a prebuild module) can be concidered optional.

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Project Homepage:

https://codeberg.org/positionhigh/MicroDexed-touch

Most recent news:

08/2024: Custom Sample playback from PSRAM is now fully in place.

Features：

MicroDexed started as a Teensy based, 6-operator-FM-synthesizer.

Compared to the first generation, MicroDexed-touch offers a lot of new features/improvements:

"Large" Graphical Interface, view and edit multiple Parameters in one Screen
Use external MIDI gear over USB or Mini TRS Jacks (DIN MIDI with adaptor) from 2 x 16 MIDI Channels in the Sequencer
Map MIDI CC to external MIDI Devices to control Input/Parameters
Global plate reverb, 2 global delay effects (500ms, with added PSRAM chip 60 seconds or even more)
Loading, playing and editing multi-sampled instruments or layered instruments in a "live" mode or played by the sequencer. Auto detection sample zones but also can be edited manually. This is early work in progress and currently not stable when using pitch shifting and polyphony
2 instances of "Virtual Analog" Monosynths with one OSC, PWM, Multimode Filter and Noise. A lot of useful new sound possibilities.
8 voice polyphonic Oscillator, based on the code of Mutable Instruments - Braids. No wavetables but added individual envelopes and multimode filters for all voices
Much improved Sequencer with 8 Tracks, 16 Step Patterns, 16 Step Pattern Chains, up to 16384 Song Steps, Arpeggiator with 1/8 - 1/64 Steps, Arp Patterns including Euclidean settings, Pitched Drum- and Instrument Sample playback
The sequencer can also play chords of various types, stacked up to 7 notes, using only a single sequencer track
Global Mixer View with all Channels
Multiband Master Compressor with 4 bands
Sample Management from SD-CARD and SPI FLASH/PSRAM, samples can be loaded from SD-CARD to PSRAM during runtime.
Since 08/2024 PSRAM is the prefered method to work with custom samples and is fully stable.
Touch Mute Matrix for live / realtime performance
Tracker View (Editor) - work in progress
Track Print/Recording - work in progress
Remote control in web-based 1:1 UI with added features (filemanager,filetransfer, screenshots etc.) Work in progress - connected to PC via Teensy MicroUSB Connector

Enhancements to prior version:
Capacitive touch display
Easy Access: PROGRAM Button (mainly useful for development)
Soft Power on/off (aimed at users building their own power/battery solution)
Option for Headphone amplifier
Digital output S/PDIF TOSLINK gives the best, possible sound quality output

If you do not want to solder the Teensy pins by yourself, or the (optional) PSRAM chip, you now can order it from:

https://protosupplies.com/product/teensy-41-microdexed/ fully soldered and tested, specially for MDT. (with 8 or 16 MB PSRAM)