I have a quad quantizer inspired by Hagiwo’s design for a dual quantizer. It uses a microcontroller board with the same RP2040 processor, and the screen display for setting the scale is similar, but the rest of the hardware is completely different. It uses a MAX5715 BAUD quad 12-bit DAC (SPI of course!) with fully buffered outputs, op-amp buffered trigger outputs and has a dedicated EEPROM to store the settings. The RP2040 is dual core, so I used an I2C OLED (the display only changes when setting the scale) and I2C EEPROM controlled by one core, with the time-critical trigger handling and SPI communication with the DAC controlled by the other.
I posted about it and various other modules way back in November 2023 when my synth was desparately in need of a second cabinet (now it needs a third 
). Details are on GitHub.