v0.19 RPiPico2 support and MIDI fixes

• RPiPico2 (RP2350) supported
• Physical MIDI in missing pull-up fixed in software
• SysEx MIDI bug fixes ... makes Dexed a useful patch editor
• Waveshare I2S DAC integration bug fixed
• Some source code improvements for future portability
• PWM audio out (cheap and nasty) build config

NOTE: Assets attached to this release are RPiPico2 builds

v0.18 Sound engine improvements + I2C LCD

• The voice generation is now shared between the two Cortex-M0 cores which has allowed the total voice count to increase to 8
• The source of several of the occasional cacophonic crashes has been identified and fixed
• Support for an I2C (instead of 8-bit parallel) 16x2 LCD is complete

v0.17 USB-MIDI

The picoX7 now appears as USB-MIDI device via the pico's USB connector.
Debug MIDI via the debug console has been removed as is no longer needed.

v0.1.6

Experimental support for Pimoroni VGA Demo board

v0.1.5

• 2x 7-segment LED and 16x12 LCD display support
• Some documentation updates including schematics

v0.1.4

• Number of voices cut back to 6 to avoid occasional audio glitches and crashing when overloaded
• Debug console baud rate increased form 9,600 to 115,200
• Complete, and more attractive, dump of currently selected patch to console
• Source refactored to more clearly show separation of firmware, EGS and OPS models
• Note pitch to frequency data path updated to more faithfully represent a real DX7

v0.1.3

Minor tidy
Fixed Linux build issue
Debug console changes

• More patch debug

• Removed MIDI debug for now

v0.1.2

Fixed some UART issues
Overclocked to 191 MHz for 8 note polyphony
Some MIDI implementation improvements

v0.1.1

Improved sound

• tuned EGS
• fixed frequency operators

Improved features

• Single voice SYSEX programming over MIDI
• 128 ROM presets available

Initial working version

Working with lots of scope for improvement!